Facebook is a social network launched on February 4, 2004.

It was founded by Mark Zuckerberg, Dustin Moskovitz, Eduardo Saverin and Chris Hughes, a former Harvard University student. Initially, the membership of Facebook was restricted to students of Harvard University.

It was expanded to Massachusetts Institute of Technology (MIT), the University of Boston, Boston College and all Ivy League schools within two months. Many individual universities were added in the following year.

Eventually, people with e-mail for universities around the world were elected to join the network.

On 27 February 2006, Facebook started accepting high school students and also a few companies. Since September 11, 2006, only users with 13 years of age or older may join. Users can join in one or more networks, such as a school, a workplace or a geographical region.

The website has more than 500 million active users, the position of Facebook in the ranking of visitor traffic from Alexa, climbed from 60th place to 7th place. is still the largest photo website of the United States, with more than 60 million new photos posted per week, surpassing even turned to photography sites like Flickr.

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