Twitter

Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as “tweets”. It was created in March 2006 by Jack Dorsey and launched that July. The service rapidly gained worldwide popularity, with over 300 million users as of 2011,[6] generating over 300 million tweets and handling over 1.6 billion search queries per day.[3][8][9] It has been described as “theSMS of the Internet.”[10]

Twitter Inc. is based in San Francisco, with additional servers and offices in New York City.

Creation

Twitter’s origins lie in a “daylong brainstorming session” held by board members of the podcasting company Odeo. Dorsey introduced the idea of an individual using an SMS service to communicate with a small group.[11] The original project code name for the service was twttr, an idea that Williams later ascribed toNoah Glass,[12] inspired by Flickr and the five-character length of American SMS short codes. The developers initially considered “10958″ as a short code, but later changed it to “40404″ for “ease of use and memorability.”[13] Work on the project started on March 21, 2006, when Dorsey published the first Twitter message at 9:50 PM Pacific Standard Time (PST): “just setting up my twttr”.[14]

“…we came across the word ‘twitter’, and it was just perfect. The definition was ‘a short burst of inconsequential information,’ and ‘chirps from birds’. And that’s exactly what the product was.” – Jack Dorsey[15]

The first Twitter prototype was used as an internal service for Odeo employees and the full version was introduced publicly on July 15, 2006.[7] In October 2006,Biz StoneEvan Williams, Dorsey, and other members of Odeo formed Obvious Corporation and acquired Odeo and all of its assets–including Odeo.com and Twitter.com–from the investors and shareholders.[16] Williams fired Glass who was silent about his part in Twitter’s startup until 2011.[17] Twitter spun off into its own company in April 2007.[18]

Reaction

The tipping point for Twitter’s popularity was the 2007 South by Southwest (SXSW) festival. During the event, Twitter usage increased from 20,000 tweets per day to 60,000.[19] ”The Twitter people cleverly placed two 60-inch plasma screens in the conference hallways, exclusively streaming Twitter messages,” remarked NewsweekSteven Levy. “Hundreds of conference-goers kept tabs on each other via constant twitters. Panelists and speakers mentioned the service, and the bloggers in attendance touted it.”[20]

Reaction at the festival was highly positive. Blogger Scott Beale said that Twitter “absolutely rul[ed]” SXSW. Social software researcher Danah Boyd said Twitter “own[ed]” the festival.[21] Twitter staff received the festival’s Web Award prize with the remark “we’d like to thank you in 140 characters or less. And we just did!”[22]

The first unassisted off-Earth Twitter message was posted from the International Space Station by NASA astronaut T. J. Creamer on January 22, 2010.[23]By late November 2010, an average of a dozen updates per day were posted on the astronauts’ communal account, @NASA_Astronauts. NASA has also hosted over 25 “tweetups”, events that provide guests with VIP access to NASA facilities and speakers with the goal of leveraging participants’ social networks to further the outreach goals of NASA.

In August 2010, the company appointed Adam Bain as President of Revenue from News Corp.‘s Fox Audience Network.[24]

On September 14, 2010, Twitter launched a redesigned site[25] including a new logo.[citation needed]

Leadership

As chief executive officer, Dorsey saw the startup through two rounds of capital funding by the venture capitalists who backed the company.[26]

On October 16, 2008,[27] Williams took over the role of CEO, and Dorsey became chairman of the board.[28]

On October 4, 2010, Williams announced that he was stepping down as CEO. Dick Costolo, formerly Twitter’s chief operating officer, became CEO. According to a Twitter blog, dated October 4, 2010, Williams was to stay[dated info] with the company and “be completely focused on product strategy.”[dated info][29]

According to The New York Times, “Mr. Dorsey and Mr. Costolo forged a close relationship” when Williams was away.[30] According to PC Magazine, Williams was “no longer involved in the day-to-day goings on at the company”. He is focused on developing a new startup, but he became a member of Twitter’s board of directors, and promised to “help in any way I can”. Stone is still with Twitter but is working with AOL as an “advisor on volunteer efforts and philanthropy”.[31]

Dorsey rejoined Twitter in March 2011, as executive chairman focusing on product development. His time is split with Square (where he is CEO), whose offices are within walking distance of Twitter’s in San Francisco.[30]

In September 2011, Board Members and investors Fred Wilson and Bijan Sabet resigned from Twitter’s Board of Directors.[32]

Growth

The company experienced rapid growth. It had 400,000 tweets posted per quarter in 2007. This grew to 100 million tweets posted per quarter in 2008. In February 2010, Twitter users were sending 50 million tweets per day.[33] By March 2010, the company recorded over 70,000 registered applications.[34] As of June 2010, about 65 million tweets were posted each day, equaling about 750 tweets sent each second, according to Twitter.[35] As noted on Compete.com, Twitter moved up to the third-highest-ranking social networking site in January 2009 from its previous rank of twenty-second.[36]

Twitter’s usage spikes during prominent events. For example, a record was set during the 2010 FIFA World Cup when fans wrote 2,940 tweets per second in the thirty-second period after Japan scored against Cameroon on June 14, 2010. The record was broken again when 3,085 tweets per second were posted after the Los Angeles Lakers‘ victory in the 2010 NBA Finals on June 17, 2010,[37] and then again at the close of Japan’s victory over Denmark in the World Cup when users published 3,283 tweets per second.[38] The current record was set during the 2011 FIFA Women’s World Cup Final between Japan and the United States, when 7,196 tweets per second were published.[39] When American singer Michael Jackson died on June 25, 2009, Twitter servers crashed after users were updating their status to include the words “Michael Jackson” at a rate of 100,000 tweets per hour.[40]

Twitter acquired application developer Atebits on April 11, 2010. Atebits had developed the Apple Design Award-winning Twitter client Tweetie for the Mac and iPhone. The application, now called “Twitter” and distributed free of charge, is the official Twitter client for the iPhone, iPad and Mac.[41]

From September through October 2010, the company began rolling out “New Twitter”, an entirely revamped edition of twitter.com. Changes included the ability to see pictures and videos without leaving Twitter itself by clicking on individual tweets which contain links to images and clips from a variety of supported websites including YouTubeFlickr, as well as a complete overhaul of the interface, which shifted links such as ‘@mentions’ and ‘Retweets’ above the Twitter stream, while ‘Messages’ and ‘Log Out’ became accessible via a black bar at the very top of twitter.com. As of November 1, 2010, the company confirmed that the “New Twitter experience” had been rolled out to all users.

On April 5, 2011, Twitter tested a new homepage, as well as phased out the “Old Twitter.”[42] However, a glitch came about after the page was launched, so the previous “retro” homepage was still in use until the issues were resolved; the new homepage was reintroduced on April 20.[43][44]

On December 8, 2011, Twitter overhauled its website once more to feature the “Fly” design, which the service says is easier for new users to follow and promotes advertising. In addition to the Homebutton, the Connect and Discover buttons were introduced along with a redesigned profile and timeline of Tweets. The site’s layout has been compared to that of Facebook.[45][46]

Features

Tweets are publicly visible by default; however, senders can restrict message delivery to just their followers. Users can tweet via the Twitter website, compatible external applications (such as forsmartphones), or by Short Message Service (SMS) available in certain countries.[47] While the service is free, accessing it through SMS may incur phone service provider fees.

Users may subscribe to other users’ tweets – this is known as following and subscribers are known as followers[48] or tweeps (Twitter + peeps).[49] The users can also check the people who are un-subscribing them on Twitter better known as unfollowing via various services.[50]

Twitter allows users the ability to update their profile by using their mobile phone either by text messaging or by apps released for certain smartphones / tablets.[51]

Twitter has been compared to a web-based Internet Relay Chat (IRC) client.[52] In a 2009 Time essay, technology author Steven Johnson described the basic mechanics of Twitter as “remarkably simple”:[53]

As a social network, Twitter revolves around the principle of followers. When you choose to follow another Twitter user, that user’s tweets appear in reverse chronological order on your main Twitter page. If you follow 20 people, you’ll see a mix of tweets scrolling down the page: breakfast-cereal updates, interesting new links, music recommendations, even musings on the future of education.

In June 2008, Twitter launched a verification program, allowing celebrities to get their accounts verified.[54] Originally intended to help users verify which celebrity accounts were created by the celebrities themselves (and therefore are not fake), they have since been used to verify accounts of businesses and accounts for public figures who may not actually tweet but still wish to maintain control over the account that bears their name – for example, the Dalai Lama. Verified accounts can be identified by a white check in a blue background, known as a verification badge, next to the user’s full name, on the profile itself or next to the name in search results.

Messages

Users can group posts together by topic or type by use of hashtags – words or phrases prefixed with a "#" sign. Similarly, the "@" sign followed by a username is used for mentioning or replying to other users.[55] To repost a message from another Twitter user, and share it with one’s own followers, the retweet function is symbolized by “RT” in the message.

In late 2009, the “Twitter Lists” feature was added, making it possible for users to follow (as well as mention and reply to) ad-hoc lists of authors instead of individual authors.[48][56]

Through SMS, users can communicate with Twitter through five gateway numbers: short codes for the United States, Canada, India, New Zealand, and an Isle of Man-based number for international use. There is also a short code in the United Kingdom which is only accessible to those on the VodafoneO2[57] and Orange[58] networks. In India, since Twitter only supports tweets from Bharti Airtel,[59] an alternative platform called smsTweet[60] was set up by a user to work on all networks.[61] A similar platform called GladlyCast[62] exists for mobile phone users in Singapore, Malaysia and the Philippines.

The messages were initially set to 140-character limit for compatibility with SMS messaging, introducing the shorthand notation and slang commonly used in SMS messages. The 140-character limit has also increased the usage of URL shortening services such as bit.ly, goo.gl, and tr.im, and content-hosting services, such as Twitpic, memozu.com and NotePub to accommodate multimediacontent and text longer than 140 characters. Twitter uses its own t.co domain for automatic shortening of all URLs posted on its website.[63]

Tweet contents

San Antonio-based market-research firm Pear Analytics analyzed 2,000 tweets (originating from the US and in English) over a two-week period in August 2009 from 11:00 AM to 5:00 PM (CST) and separated them into six categories:[64]

  • Pointless babble – 40%
  • Conversational – 38%
  • Pass-along value – 9%
  • Self-promotion – 6%
  • Spam – 4%
  • News – 4%[64]

Social networking researcher Danah Boyd responded to the Pear Analytics survey by arguing that what the Pear researchers labelled “pointless babble” is better characterized as “social grooming” and/or “peripheral awareness” (which she explains as persons “want[ing] to know what the people around them are thinking and doing and feeling, even when co-presence isn’t viable”).[65]

Rankings

Twitter is ranked as one of the ten-most-visited websites worldwide by Alexa’s web traffic analysis.[66] Daily user estimates vary as the company does not publish statistics on active accounts. A February 2009 Compete.com blog entry ranked Twitter as the third most used social network based on their count of 6 million unique monthly visitors and 55 million monthly visits.[67] In March 2009, a Nielsen.com blog ranked Twitter as the fastest-growing website in the Member Communities category for February 2009. Twitter had annual growth of 1,382 percent, increasing from 475,000 unique visitors in February 2008 to 7 million in February 2009. It was followed by Zimbio with a 240 percent increase, and Facebook with a 228 percent increase.[68]Twitter has a user retention rate of forty percent.[69]

Adding and following content

There are numerous tools for adding content, monitoring content and conversations including Twitvid (video sharing),[70] TweetdeckSalesforce.com,HootSuite, and Twitterfeed. Less than half of tweets are posted using the web user interface with most users using third-party applications (based on analysis of 500 million tweets by Sysomos).[71]

Trends

A word, phrase or topic that is tagged at a greater rate than other tags is said to be a trending topic. Trending topics become popular either through a concerted effort by users or because of an event that prompts people to talk about one specific topic.[72] These topics help Twitter and their users to understand what is happening in the world.[73]

Trending topics are sometimes the result of concerted efforts by fans of certain celebrities or cultural phenomena, particularly Lady Gaga (known as Monsters), Justin Bieber (Beliebers), One Direction(Directioners), and the Twilight and Harry Potter novels. Twitter have altered the trend algorithm in the past to prevent manipulation of this type[74].

Twitter’s 30 March 2010 blog post announced that the hottest Twitter trending topics will scroll across the Twitter homepage.[75] Users will also be able to find out why a specific topic got to be a trending topic.

There have been controversy surrounding the Twitter trending topics: Twitter censored hashtags that their users found offensive. Twitter censored the #Thatsafrican[76] and the #thingsdarkiessay[77]hashtags after users complained that they found the hashtags offensive.

Authentication

As of August 31, 2010, third-party Twitter applications are required to use OAuth, an authentication method that does not require users to enter their password into the authenticating application. Previously, the OAuth authentication method was optional, it is now compulsory and the user-name/password authentication method has been made redundant and is no longer functional. Twitter stated that the move to OAuth will mean “increased security and a better experience.”[78]

Demographics

Twitter is mainly used by older adults who might not have used other social sites before Twitter, said Jeremiah Owyang, an industry analyst studying social media. “Adults are just catching up to what teens have been doing for years,” he said.[81] According to comScore only eleven percent of Twitter’s users are aged twelve to seventeen.[81] comScore attributes this to Twitter’s “early adopter period” when the social network first gained popularity in business settings and news outlets attracting primarily older users. However, comScore as of late, has stated that Twitter has begun to “filter more into the mainstream”, and “along with it came a culture of celebrity as ShaqBritney Spears and Ashton Kutcher joined the ranks of the Twitterati.”[82]

According to a study by Sysomos in June 2009, women make up a slightly larger Twitter demographic than men — fifty-three percent over forty-seven percent. It also stated that five percent of users accounted for seventy-five percent of all activity, and that New York has the most Twitter users.[83]

According to Quancast, twenty-seven million people in the US used Twitter as of September 3, 2009. Sixty-three percent of Twitter users are less than thirty-five years old; sixty percent of Twitter users are Caucasian, but a higher than average (compared to other Internet properties) are African American (sixteen percent) and Hispanic (eleven percent); fifty-eight percent of Twitter users have a total household income of at least $60,000.[84]

On September 7, 2011, Twitter announced that it has 100 million active users logging in at least once a month and 50 million active users every day.[85]

In an article published on January 6th, 2012, Twitter was confirmed to be the biggest social media network in Japan, with Facebook following closely in second. comScore confirmed this, stating that Japan is the only country in the world where Twitter leads Facebook.[86]

Facebook

Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc.[1] As of January 2012, Facebook has more than 800 million active users.[6] Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics, and categorize their friends into lists such as “People From Work” or “Close Friends”. The name of the service stems from the colloquial name for the book given to students at the start of the academic year by some university administrations in the United States to help students get to know each other. Facebook allows any users who declare themselves to be at least 13 years old to become registered users of the site.[7]

Facebook was founded by Mark Zuckerberg with his college roommates and fellow students Eduardo SaverinDustin Moskovitz and Chris Hughes.[8] The Web site’s membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and Stanford University. It gradually added support for students at various other universities before opening to high school students, and eventually to anyone aged 13 and over. However, based on ConsumersReports.org in May 2011, there are 7.5 million children under 13 with accounts, violating the site’s terms of service.[9]

A January 2009 Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users.[10] Entertainment Weekly included the site on its end-of-the-decade “best-of” list, saying, “How on earth did we stalk our exes, remember our co-workers’ birthdays, bug our friends, and play a rousing game of Scrabulous before Facebook?”[11] Quantcast estimates Facebook has 138.9 million monthly unique U.S. visitors in May 2011.[12] According to Social Media Today, in April 2010 an estimated 41.6% of the U.S. population had a Facebook account.[13] Nevertheless, Facebook’s market growth started to stall in some regions, with the site losing 7 million active users in the United States and Canada in May 2011.[14]

Hstory:

Mark Zuckerberg wrote Facemash, the predecessor to Facebook, on October 28, 2003, while attending Harvard as a sophomore. According to The Harvard Crimson, the site was comparable to Hot or Not, and “used photos compiled from the online facebooks of nine houses, placing two next to each other at a time and asking users to choose the ‘hotter’ person”.[15][16]

To accomplish this, Zuckerberg hacked into the protected areas of Harvard’s computer network and copied the houses’ private dormitory ID images. Harvard at that time did not have a student “facebook” (a directory with photos and basic information). Facemash attracted 450 visitors and 22,000 photo-views in its first four hours online.[15][17]

The site was quickly forwarded to several campus group list-servers, but was shut down a few days later by the Harvard administration. Zuckerberg was charged by the administration with breach of security, violating copyrights, and violating individual privacy, and faced expulsion. Ultimately, however, the charges were dropped.[18] Zuckerberg expanded on this initial project that semester by creating a social study tool ahead of an art history final, by uploading 500 Augustan images to a Web site, with one image per page along with a comment section.[17] He opened the site up to his classmates, and people started sharing their notes.

The following semester, Zuckerberg began writing code for a new Web site in January 2004. He was inspired, he said, by an editorial in The Harvard Crimson about the Facemash incident.[19] On February 4, 2004, Zuckerberg launched “Thefacebook”, originally located at thefacebook.com.[20]

Six days after the site launched, three Harvard seniors, Cameron WinklevossTyler Winklevoss, and Divya Narendra, accused Zuckerberg of intentionally misleading them into believing he would help them build a social network called HarvardConnection.com, while he was instead using their ideas to build a competing product.[21]The three complained to the Harvard Crimson, and the newspaper began an investigation. The three later filed a lawsuit against Zuckerberg, subsequently settling.[22]

Membership was initially restricted to students of Harvard College, and within the first month, more than half the undergraduate population at Harvard was registered on the service.[23] Eduardo Saverin(business aspects), Dustin Moskovitz (programmer), Andrew McCollum (graphic artist), and Chris Hughes soon joined Zuckerberg to help promote the Web site. In March 2004, Facebook expanded toStanfordColumbia, and Yale.[24] It soon opened to the other Ivy League schools, Boston UniversityNew York UniversityMIT, and gradually most universities in Canada and the United States.[25][26]

Facebook was incorporated in mid-2004, and the entrepreneur Sean Parker, who had been informally advising Zuckerberg, became the company’s president.[27] In June 2004, Facebook moved its base of operations to Palo Alto, California.[24] It received its first investment later that month from PayPal co-founder Peter Thiel.[28] The company dropped The from its name after purchasing thedomain name facebook.com in 2005 for $200,000.[29]

Facebook launched a high-school version in September 2005, which Zuckerberg called the next logical step.[38] At that time, high-school networks required an invitation to join.[39] Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. and Microsoft.[40] Facebook was then opened on September 26, 2006, to everyone of age 13 and older with a validemail address.[41][42]

On October 24, 2007, Microsoft announced that it had purchased a 1.6% share of Facebook for $240 million, giving Facebook a total implied value of around $15 billion.[43] Microsoft’s purchase included rights to place international ads on Facebook.[44] In October 2008, Facebook announced that it would set up its international headquarters in Dublin, Ireland.[45] In September 2009, Facebook said that it had turned cash-flow positive for the first time.[46] In November 2010, based on SecondMarket Inc., an exchange for shares of privately held companies, Facebook’s value was $41 billion (slightly surpassing eBay‘s) and it became the third largest U.S. Web company afterGoogle and Amazon.[47] Facebook has been identified as a possible candidate for an IPO by 2013.[48] The Wall Street Journal has reported that Facebook is looking to raise as much as $10 billion in its IPO.[49][50]

Traffic to Facebook increased steadily after 2009. More people visited Facebook than Google for the week ending March 13, 2010.[51]

In March 2011 it was reported that Facebook removes approximately 20,000 profiles from the site every day for various infractions, including spam, inappropriate content and underage use, as part of its efforts to boost cyber security.[52]

In early 2011, Facebook announced plans to move to its new headquarters, the former Sun Microsystems campus in Menlo Park, California.[53][54]

Release of statistics by DoubleClick showed that Facebook reached one trillion pageviews in the month of June 2011, making it the most visited Web site in the world.[55] It should however be noted that Google and some of its selected Web sites are not counted in the DoubleClick rankings. According to the Nielsen Media Research study, released in December 2011, Facebook is the second most accessed website in the US.[56]

Company:

Ownership

The ownership percentages of the company are[when?] as follows. Mark Zuckerberg: 24%, Accel Partners: 10%, Digital Sky Technologies: 10%,[57] Dustin Moskovitz: 6%, Eduardo Saverin: 5%, Sean Parker: 4%, Peter Thiel: 3%, Greylock Partners and Meritech Capital Partners: between 1 to 2% each,Microsoft: 1.3%, Li Ka-shing: 0.75%, the Interpublic Group: less than 0.5%. A small group of current and former employees and celebrities own less than 1% each, including Matt Cohler, Jeff Rothschild, Adam D’AngeloChris Hughes, and Owen Van Natta, while Reid Hoffman and Mark Pincus have sizable holdings of the company. The remaining 30% or so are owned by employees, an undisclosed number of celebrities, and outside investors.[58] Adam D’Angelo, chief technology officer and friend of Zuckerberg, resigned in May 2008. Reports claimed that he and Zuckerberg began quarreling, and that he was no longer interested in partial ownership of the company.[59]

Management

Key management personnel comprise Chris Cox (VP of Product), Sheryl Sandberg (COO), and Donald E. Graham (Chairman). As of April 2011, Facebook has over 2,000 employees, and offices in 15 countries.[60]

Revenue

Most of Facebook’s revenue comes from advertising.[61][62] Microsoft is Facebook’s exclusive partner for serving banner advertising,[63] and therefore Facebook serves only advertisements that exist in Microsoft’s advertisement inventory.

Facebook generally has a lower clickthrough rate (CTR) for advertisements than most major Web sites. According to BusinessWeek.com, banner advertisements on Facebook have generally received one-fifth the number of clicks compared to those on the Web as a whole,[70] although specific comparisons can reveal a much larger disparity. For example, while Google users click on the first advertisement for search results an average of 8% of the time (80,000 clicks for every one million searches),[71] Facebook’s users click on advertisements an average of 0.04% of the time (400 clicks for every one million pages).[72]

Sarah Smith, who was Facebook’s Online Sales Operations Manager, reports that successful advertising campaigns on the site can have clickthrough rates as low as 0.05% to 0.04%, and that CTR for ads tend to fall within two weeks.[73] By comparison, the CTR for competing social network MySpace is about 0.1%, about 2.5 times better than Facebook’s rate but still low compared to many other Web sites. According to BizReport.com, Facebook’s low CTR is because Facebook users are more technologically savvy and therefore use ad blocking software to hide advertisements, users are younger and therefore better at ignoring advertising messages, users spend their time communicating with friends and therefore have their attention diverted away from advertisements.[74]

On pages for brands and products, however, some companies have reported CTR as high as 6.49% for Wall posts.[75] A study found that, for video advertisements on Facebook, over 40% of users who viewed the videos viewed the entire video, while the industry average was 25% for in-banner video ads.[76]

Website:

Users can create profiles with photos, lists of personal interests, contact information, and other personal information. Users can communicate with friends and other users through private or public messages and a chat feature. They can also create and join interest groups and “like pages” (called “fan pages” until April 19, 2010), some of which are maintained by organizations as a means of advertising.[79]

To allay concerns about privacy, Facebook enables users to choose their own privacy settings and choose who can see specific parts of their profile.[80] The Web site is free to users, and generates revenue from advertising, such as banner ads.[81] Facebook requires a user’s name and profile picture (if applicable) to be accessible by everyone. Users can control who sees other information they have shared, as well as who can find them in searches, through their privacy settings.[82]

The media often compares Facebook to MySpace, but one significant difference between the two Web sites is the level of customization.[83]Another difference is Facebook’s requirement that users give their true identity, a demand that MySpace does not make.[84] MySpace allows users to decorate their profiles using HTML and Cascading Style Sheets (CSS), while Facebook allows only plain text.[85] Facebook has a number of features with which users may interact. They include the Wall, a space on every user’s profile page that allows friends to post messages for the user to see;[86] Pokes, which allows users to send a virtual “poke” to each other (a notification then tells a user that they have been poked);[87] Photos, where users can upload albums and photos;[88] and Status, which allows users to inform their friends of their whereabouts and actions.[89] Depending on privacy settings, anyone who can see a user’s profile can also view that user’s Wall. In July 2007, Facebook began allowing users to post attachments to the Wall, whereas the Wall was previously limited to textual content only.[86]

On September 6, 2006, a News Feed was announced, which appears on every user’s homepage and highlights information including profile changes, upcoming events, and birthdays of the user’s friends.[90] This enabled spammers and other users to manipulate these features by creating illegitimate events or posting fake birthdays to attract attention to their profile or cause.[91] Initially, the News Feed caused dissatisfaction among Facebook users; some complained it was too cluttered and full of undesired information, others were concerned that it made it too easy for others to track individual activities (such as relationship status changes, events, and conversations with other users).[92]

In response, Zuckerberg issued an apology for the site’s failure to include appropriate customizable privacy features. Since then, users have been able to control what types of information are shared automatically with friends. Users are now able to prevent user-set categories of friends from seeing updates about certain types of activities, including profile changes, Wall posts, and newly added friends.[93]

On February 23, 2010, Facebook was granted a patent[94] on certain aspects of its News Feed. The patent covers News Feeds in which links are provided so that one user can participate in the same activity of another user.[95] The patent may encourage Facebook to pursue action against Web sites that violate its patent, which may potentially include Web sites such as Twitter.[96]

One of the most popular applications on Facebook is the Photos application, where users can upload albums and photos.[97] Facebook allows users to upload an unlimited number of photos, compared with other image hosting services such as Photobucket and Flickr, which apply limits to the number of photos that a user is allowed to upload. During the first years, Facebook users were limited to 60 photos per album. As of May 2009, this limit has been increased to 200 photos per album.[98][99][100][101]

Privacy settings can be set for individual albums, limiting the groups of users that can see an album. For example, the privacy of an album can be set so that only the user’s friends can see the album, while the privacy of another album can be set so that all Facebook users can see it. Another feature of the Photos application is the ability to “tag“, or label, users in a photo. For instance, if a photo contains a user’s friend, then the user can tag the friend in the photo. This sends a notification to the friend that they have been tagged, and provides them a link to see the photo.[102]

Facebook Notes was introduced on August 22, 2006, a blogging feature that allowed tags and embeddable images. Users were later able to import blogs from XangaLiveJournalBlogger, and other blogging services.[41] During the week of April 7, 2008, Facebook released a Comet-based[103] instant messaging application called “Chat” to several networks,[104] which allows users to communicate with friends and is similar in functionality to desktop-based instant messengers.

Facebook launched Gifts on February 8, 2007, which allows users to send virtual gifts to their friends that appear on the recipient’s profile. Gifts cost $1.00 each to purchase, and a personalized message can be attached to each gift.[105][106] On May 14, 2007, Facebook launchedMarketplace, which lets users post free classified ads.[107] Marketplace has been compared to Craigslist by CNET, which points out that the major difference between the two is that listings posted by a user on Marketplace are seen only by users in the same network as that user, whereas listings posted on Craigslist can be seen by anyone.[108]

On July 20, 2008, Facebook introduced “Facebook Beta”, a significant redesign of its user interface on selected networks. The Mini-Feed and Wall were consolidated, profiles were separated into tabbed sections, and an effort was made to create a “cleaner” look.[109] After initially giving users a choice to switch, Facebook began migrating all users to the new version starting in September 2008.[110] On December 11, 2008, it was announced that Facebook was testing a simpler signup process.[111]

On June 13, 2009, Facebook introduced a “Usernames” feature, whereby pages can be linked with simpler URLs such ashttp://www.facebook.com/facebook instead of http://www.facebook.com/profile.php?id=20531316728.[112] Many newsmartphones offer access to Facebook services through either their Web browsers or applications. An official Facebook application is available for the operating systems AndroidiOS, and webOSNokia and Research In Motion both provide Facebook applications for their own mobile devices. More than 150 million active users access Facebook through mobile devices across 200 mobile operators in 60 countries.

On November 15, 2010, Facebook announced a new “Facebook Messages” service. In a media event that day, CEO Mark Zuckerberg said, “It’s true that people will be able to have an @facebook.com email addresses, but it’s not email”. The launch of such a feature had been anticipated for some time before the announcement, with some calling it a “Gmail killer”. The system, to be available to all of the Web site’s users, combinestext messaginginstant messagingemails, and regular messages, and will include privacy settings similar to those of other Facebook services. Codenamed “Project Titan”, Facebook Messages took 15 months to develop.[113][114]

In February 2011, Facebook began to use the hCalendar microformat to mark up events, and the hCard microformat for the events’ venues, enabling the extraction of details to users’ own calendar or mapping applications.[115]

Since April 2011 Facebook users have had the ability to make live voice calls via Facebook Chat, allowing users to chat with others from all over the world. This feature, which is provided free through T-Mobile’s new Bobsled service, lets the user add voice to the current Facebook Chat as well as leave voice messages on Facebook.[116]

On July 6, 2011, Facebook launched its video calling services using Skype as its technology partner. It allows one to one calling using a Skype Rest API.[117]

On September 14, 2011, Facebook launched a Subscribe button. The feature allows for users to follow public updates, and these are the people most often broadcasting their ideas.[118] There were major modifications that the site released on September 22, 2011.[119]

Functionality issues

As of December 2011, users with computers that use the PowerPC G5 processor are not able to view Flash content from within Facebook as it requires the latest upgrade of Adobe Flash player which is not compatible with this processor architecture. Due to this issue, video content hosted on Facebook can no longer be played on devices using the G5 processor.

Privacy

According to comScore, an internet marketing research company, Facebook collects as much data from its visitors as Google and Microsoft, but considerably less than Yahoo!.[120] In 2010, the security team began expanding its efforts to reduce the risks to users’ privacy,[121] but privacy concerns remain. On November 6, 2007, Facebook launched Facebook Beacon, which was an ultimately failed attempt to advertise to friends of users using the knowledge of what purchases friends made.

FTC settlement

On November 29, 2011, Facebook agreed to settle US Federal Trade Commission charges that it deceived consumers by failing to keep privacy promises.[122]