10 Years of Facebook: A Decade in Review

Facebook will officially have been around for a decade on Tuesday, Feb. 4, 2014. Take a look back at some of the social network's biggest highlights from the last 10 years.

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Feb. 4, 2004: Facebook, known as "thefacebook.com," goes live. Mark Zuckerberg — along with Harvard University roommates Dustin Moskovitz, Chris Hughes and Eduardo Saverin — launches the social networking site exclusively for elite U.S. colleges. Facebook hits 1 million users just 10 months later.
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Sept. 2, 2004: Cameron and Tyler Winklevoss, founders of social networking platform ConnectU, sue Zuckerberg for $140 million, claiming he stole the idea for Facebook from them. (In 2008, the brothers sign a settlement valued at $65 million, but appeals and lawsuits continued until 2011.)
Sept. 20, 2005: The site officially becomes "Facebook" and opens its networks to high school students for the first time. A year later, on Sept. 26, 2006, Facebook expands its networks to allow anyone with an email address to join.
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May 24, 2007: The Facebook Platform is launched. The software platform enables third-party developers and entrepreneurs to build social apps, websites and tools for Facebook.
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April 6, 2008: Facebook Chat is launched, providing users with real-time communication. The platform works directly in the Facebook browser, allowing users to connect instantly and more efficiently.
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Feb. 9, 2009: Facebook introduces the "Like" button. The new function quickly became the quickest way for users to recommend and share content with their friends.
April 9, 2012: Facebook acquires Instagram for $1 billion. Adding the popular photo-sharing app further expands Facebook's social networks. (On June 20, 2013, Facebook introduces a video feature for Instagram that competes directly with Twitter's Vine app.)
May 18, 2012: Facebook holds its initial public offering, with its stock priced at $38 per share for its IPO and a peak market capitalization of over $104 billion. The IPO raises $16 billion, making it the third largest IPO in U.S. history.
Oct. 4, 2012: Mark Zuckerberg writes: "This morning, there are more than one billion people using Facebook actively each month. If you're reading this: thank you for giving me and my little team the honor of serving you. Helping a billion people connect is amazing, humbling and by far the thing I am most proud of in my life."
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Jan. 15, 2013: Facebook fully launches Graph Search in the U.S., allowing users to quickly and easily discover connections among friends. A few months later, Facebook adds Hashtags, further expediting conversation and simplifying the search tool.
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Feb. 4, 2014: Facebook turns 10 years old, topping 1.23 billion monthly active users around the world. Eighty-one percent of daily active users are outside the U.S. and Canada. Facebook is now worth around $153 billion, and 29-year-old Zuckerberg is the youngest billionaire on the Bloomberg list's top 150.
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