FACE BOOK ?

Facebook is a social networking website launched in February 2004 that is operated and privately owned by Facebook, Inc.,^[1][5] active users in July 2010.^{[6][N 1]} Users can add people as friends and send them messages, and update their personal profiles to notify friends about themselves. Additionally, users can join networks organized by workplace, school, or college. The website’s name stems from the colloquial name of books given to students at the start of the academic year by university administrations in the US with the intention of helping students to get to know each other better. Facebook allows anyone who declares themselves to be aged 13 or older to become a member of the website. with more than 500 million

Facebook was founded by Mark Zuckerberg with his college roommates and fellow computer science students Eduardo Saverin, Dustin Moskovitz and Chris Hughes.^[7] The website’s membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and Stanford University. It gradually added support for students at various other universities before opening to high school students, and, finally, to anyone aged 13 and over.

Facebook has met with some controversy. It has been blocked intermittently in several countries including Pakistan,^[8] Syria,^[9]People’s Republic of China,^[10] Vietnam,^[11] and Iran.^[12] It has also been banned at many places of work to discourage employees from wasting time using the service.^[13] Privacy has also been an issue, and it^{[clarification needed]} has been compromised several times. Facebook settled a lawsuit regarding claims over source code and intellectual property.^[14] The site has also been involved in controversy over the sale of fans and friends.^[15]

 sources : http://en.wikipedia.org/wiki/Facebook