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Facebook

A January 2009 Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users. Facebook is a social networking service launched in 2004, owned and operated by Facebook, Inc. In 2012, Facebook has over 955 million active users.

Facebook was founded by Mark Zuckerberg with his college roommates. The website’s membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area.

Facebook has affected the social life and activity of people in various ways. With its availability on many mobile devices, Facebook allows users to continuously stay in touch with friends, relatives and other acquaintances wherever they are in the world, as long as there is access to the Internet.

Facebook is the bigest social network. The second is Google+ (250 millions), Twitter.com (200 millions) , LinkedIn.com  (100 millions)