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Facebook is a social network service and website launched in February 2004 that is operated and privately owned by Facebook,Inc.

A social network service is an online service, platform, or site that focuses on building and reflecting of social networks or social relations among people, e.g., who share interests and/or activities. A social network service essentially consists of a representation of each user (often a profile), his/her social links, and a variety
of additional services.

Facebook was founded by Mark Zuckerberg with his college roommates and fellow computer science students Eduardo Saverin, Dustin Moskovitz and Chris Hughes.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.

Users can create profiles with photos, lists of personal interests, contact information and other personal information. Communicating with friends and other users can be done through private or public messages or a chat feature. Users can also create and join interest groups and "like pages" (formerly called "fan pages" until April 19, 2010), some of which are maintained by organizations as a means of advertising.

Where users can upload albums and photos and Status, which allows users to inform their friends of their whereabouts and actions. Depending on privacy settings, anyone who can see a user's profile can also view that user's Wall. In July 2007, Facebook began allowing users to post attachments to the Wall, whereas the Wall was previously limited to textual content only.

The Social Network, a drama film directed by David Fincher about the founding of Facebook, was released October 1, 2010. The film features an ensemble cast consisting of Jesse Eisenberg as Mark Zuckerberg, Andrew Garfield as Eduardo Saverin, Justin Timberlake as Sean Parker, and Armie Hammer as Cameron and Tyler Winklevoss. The film was written by Aaron Sorkin and adapted from Ben Mezrich's 2009 book. The film was distributed by Columbia Pictures. No staff members of Facebook, including Zuckerberg, was involved with the project.

However, one of Facebook's co-founders, Eduardo Saverin, was a consultant for Mezrich's book. Mark Zuckerberg has saidthat The Social Network is inaccurate.