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Facebook is an online social networking service. Its name stems from the colloquial name for tto students at the start of the academic year by some American university administrations to heget to know each other.[7] Facebook was founded in February 2004 by Mark Zuckerberg with his croommates and fellow Harvard University students Eduardo Saverin, Andrew McCollum, DustinMoskovitz and Chris Hughes.[8] The website's membership was initially limited by the founders tstudents, but was expanded to other colleges in the Boston area, the Ivy League, and Stanford U

gradually added support for students at various other universities before opening to high schoand eventually to anyone aged 13 and over. Facebook now allows any users who declare themseleast 13 years old to become registered users of the site.[9] 

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Users must register before using the site, after which they may create a personal profile, add otheexchange messages, and receive automatic notifications when they update their profile. Addition join common-interest user groups, organized by workplace, school or college, or other charactericategorize their friends into lists such as "People From Work" or "Close Friends". As of September has over one billion active users,[10] of which 8.7% are fake.[11] According to a May 2011 Consumer R

there are 7.5 million children under 13 with accounts and 5 million under 10, violating the site's terservice.[12] Facebook (as of 2012) has about 180 petabytes of data a year and grows by over half a phours

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In May 2005, Accel partners invested $12.7 million in Facebook, and Jim Breyer[14] added $1 millown money to the pot. A January 2009 Compete.com study ranked Facebook as the most used snetworking service by worldwide monthly active users.[15] Entertainment Weekly   included the send-of-the-decade "best-of" list, saying, "How on earth did we stalk our exes, remember our co-birthdays, bug our friends, and play a rousing game of Scrabulous before Facebook?"[16] Faceboeventually filed for an initial public offeringon February 1, 2012, and was headquartered in MenPark , California.[2] Facebook Inc. began selling stock to the public and trading on the NASDAQ on2012.[17] Based on its 2012 income of USD 5.1 Billion, Facebook joined the Fortune 500 list for thebeing placed at position of 462 on the list published in May 2013.

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Mark Zuckerberg wrote Facemash, the predecessor to Facebook, on October 28, 2003, whileattending Harvard as a sophomore. According to The Harvard Crimson , the site was comparableNot, and "used photos compiled from the online facebooks of nine houses, placing two next to ea time and asking users to choose the 'hotter' person"[19][20] To accomplish this, Zuckerberg hacked into the protected areas of Harvard's computer network

the houses' private dormitory ID images. Harvard at that time did not have a student "Facebook " with photos and basic information), though individual houses had been issuing their own papersince the mid-1980s. Facemash attracted 450 visitors and 22,000 photo-views in its first four hoonline.[19][21] The site was quickly forwarded to several campus group list-servers, but was shut down a few dthe Harvard administration. Zuckerberg faced expulsion and was charged by the administrationof security, violating copyrights, and violating individual privacy. Ultimately, the charges weredropped.[22]Zuckerberg expanded on this initial project that semester by creating a social study

of an art history final, by uploading 500 Augustan images to a website, with one image per pagecomment section.[21] He opened the site up to his classmates, and people started sharing their nThe following semester, Zuckerberg began writing code for a new website in January 2004. He whe said, by an editorial in The Harvard Crimson about the Facemash incident.[23] On February 4, 2Zuckerberg launched "Thefacebook", originally located at thefacebook.com.[24] 

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Six days after the site launched, three Harvard seniors, Cameron Winklevoss, Tyler Winklevoss, anNarendra, accused Zuckerberg of intentionally misleading them into believing he would help themsocial network called HarvardConnection.com, while he was instead using their ideas to build a coproduct.[25] The three complained to the Harvard Crimson , and the newspaper began an investigatthree later filed a lawsuit against Zuckerberg, subsequently settling.[26] The agreed settlement wa

shares which were worth $300m at Facebook's IPO.[27]

 Membership was initially restricted to students of Harvard College, and within the first month, morthe undergraduate population at Harvard was registered on the service.[28] Eduardo Saverin (businaspects), Dustin Moskovitz (programmer), Andrew McCollum (graphic artist), and Chris Hughes sooZuckerberg to help promote the website. In March 2004, Facebook expanded to Stanford, Columbia Yale.[29] It soon opened to the other Ivy League schools,Boston University, New York University, MIT, gradually most universities in Canada and the United States.[30][31] In mid-2004, entrepreneur Sean Parker, who had been informally advising Zuckerberg, became the

president.[32]

In June 2004, Facebook moved its base of operations to Palo Alto, California.[29]

It receinvestment later that month from PayPal co-founder Peter Thiel.[33] The company dropped The fromafter purchasing the domain name facebook.com in 2005 for $200,000

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In March 2011, it was reported that Facebook removes approximately 20,000 profiles from the sitfor various infractions, including spam, inappropriate content and underage use, as part of its efcyber security.[47] In early 2011, Facebook announced plans to move to its new headquarters, the former SunMicrosystems campus in Menlo Park, California.[48][49] Release of statistics by DoubleClick showed that Facebook reached one trillion page views in thJune 2011, making it the most visited website of those tracked by DoubleClick.[50]  According to the Nielsen Media Research study, released in December 2011, Facebook is the secaccessed website in the US (behind Google).[51] In March 2012, Facebook announced App Center, an online mobile store which sells applications to Facebook. The store will be available to iPhone, Android and mobile web users.[52] Facebook, Inc. held an initial public offering on May 17, 2012, negotiating a share price of $38 apiethe company at $104 billion, the largest valuation to date for a newly listed public company.[5