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Facebook is founded by Harvard classmates Mark Zuckerberg, Eduardo Saverin, Dustin Moskovitz and Chris Hughes. At the time, it was known as Thefacebook.
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Facebook gets its first big investors. Venture capitalist Peter Thiel sees promise in the new company and invests $500,000 in Facebook. Sean Parker, the founder of Napster, becomes Facebook's president.
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Cameron and Tyler Winklevoss claim Zuckerberg stole the idea for Facebook from them and sue the company. After years of legal wrangling and dismissals, the twins drop their lawsuits in 2011.
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Microsoft buys a 1.4 percent stake in the company, valuing Facebook at $15 billion.
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Facebook rebuffs an offer from media giant Viacom to buy the site for $75 million.
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Yahoo! offers to buy Facebook for $1 billion. Facebook rejects the offer.
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Facebook reaches 100 million active users
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Facebook overtakes MySpace to become the Internet's largest social network.
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The Social Network premieres. The Oscar-nominated film traces the history of Facebook and delves into the squabbles between Zuckerberg, Saverin and the Winklevoss twins.
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Game company Zynga makes their social games available on Facebook. These include hits such as Farmville, Mafia Wars and Cafe World.
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Facebook roles out the popular Like button, which users utilize to denote content they appreciate.