add the login for facebook through wiki
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Facebook (/ˈfeɪsˌbʊk/) originally The Facebook, is a global social networking website. Facebook is owned by Facebook, Inc.
It was founded by Mark Zuckerberg while he was an undergraduate at Harvard University. Originally, Facebook was only available to Harvard University students, but eventually spread to college students in Boston, college students around the world, then people at age 18 or over. Facebook maintains the position of being the most popular social website with 3,000 million active users worldwide. It is the most famous social website.
Some countries have blocked Facebook, including China and Syria, claiming that Facebook discloses private information and wastes the time of members.
New movie "Social Network" will explain more about facebook and how it originated. Mark Zuckerberg made the site because he didn't have a lot of friends and he didn't have a girlfriend. But it expanded. People used it more, and he invested into his site and now it is known from almost everyone in USA!