Facebook is a social networking service that was launched in February 2004, is owned and operated by Facebook, Inc.. In September 2012, Facebook has more than more one billion active users, more than half of them using a mobile phone. Users must register before you can use the site. After that, the user can create a personal profile, add other users as a friends, and exchange message, including automatic notification when they update their profile. Additionally, users ca join a group of users with the same interests, sorted by workplace, school or college, or other characteristics, and categorize their friends into lists such as "colleagues" or "close friend".
Facebook was founded by Mark Zuckerberg with his college roommates and fellow students of Harvard University, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Huges. membership website is initally limited to Harvard students only, then expanded to other colleges in the Boston, Ivy League, and Stanford University. This site is slowly opening up to students at other universities before opening to high school students, and eventually to every persons at least 13 years of age. Even so, according to the Consumer Reports survey in May 2011, there are 7.5 million children under the age 13 years who has facebook account and another 5 million under 10 years, thus violating the site's terms of services.
January 2009 Compete.com study put Facebook as a social networking service most widely used by the number of monthly active users worldwide. Entertainment Weekly put it list of "best" end of the decade with the comment, "How can we stalk our ex-lover, remember the anniversary of our co-workers, friend annoy us, and play Scrabulous before Facebook
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