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Facebook (then called "thefacebook") was founded by Zuckerberg, Moskovitz, Saverin and Hughes.
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Facebook spreads to three other college campuses - Yale, Columbia and Stanford.
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The site launches the now infamous "wall" - which allows users to post things and receive messages on their own page.
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Facebook hits 1 million users.
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The site expands to high school networks. It also drops the "the" to become just "Facebook."
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Facebook adds photos and goes international.
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Facebook goes mobile.
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Anyone can now join Facebook.
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Over 500 million users are active on Facebook.
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Acquisition of Instagram is announced.
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Acquisition of WhatsApp is announced.
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Over 1 billion users of Messenger a month.
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Facebook is allegedly making changes to improve security by hiring more security experts.
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Facebook is sued by shareholders following stock plummet.
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Zuckerberg testifies before Congress regarding concerns over data and privacy breaches.