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Facebook is a social networking website that was founded in February 2004 by Harvard University students Chris Hughes, Andrew McCollum, Dustin Moskovitz, Eduardo Saverin and Mark Zuckerberg.

The idea behind Facebook was to provide an online book of faces for university students to connect and share information. It was initially a social network for Harvard and expanded in the following years to any university. It eventually became a social network for anyone, anywhere in the world.

Facebook can be accessed from devices with Internet connectivity, such as personal computers, tablets and smartphones. After registering, users can create a profile revealing personal information about themselves. They can post text, photos and multimedia which are shared with any other users who have agreed to be their friend or, with different privacy settings, publicly.

The Facebook name came from the paper document with names and faces issued to Harvard freshmen to help them get acquainted with each other. The site is free to members and derives its revenue from ads.