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Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc.[1] As of January 2012[update], Facebook has more than 800 million active users.
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YouTube is a video-sharing website, created by three former PayPal employees in February 2005, on which users can upload, view and share videos.
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Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July.
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