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Founded: 2004
Estimated users: 34 million
Addictiveness rating: 9
Originally developed by Harvard student Mark Zuckerberg and designed so that students on campus could stay in touch it has since become one of the most popular sites on the web. It is now available to anybody with a valid email address.
Estimated users: 34 million
Addictiveness rating: 9
Originally developed by Harvard student Mark Zuckerberg and designed so that students on campus could stay in touch it has since become one of the most popular sites on the web. It is now available to anybody with a valid email address.













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