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per Wikipedia
Facebook is a social networking website launched on February 4, 2004. The website is owned and operated by Facebook, Inc., the privately held parent company of the website. The free-access website allows users to join networks, such as a school, place of employment, or geographic region, to connect and interact with other people. Users can post messages for their friends to see, and update their personal profile to notify friends about themselves. The name of the website refers to the paper facebooks depicting members of a campus community that some American colleges and preparatory schools give to incoming students, faculty, and staff, as a way to get to know other people on campus.

Mark Zuckerberg founded Facebook while still a student at Harvard University. Website membership was initially limited to only Harvard students, but was expanded to the Ivy League. It later expanded further to include any university student, then high school students, and finally, to anyone aged 13 and over.

The website has more than 69 million active users worldwide.[4] According to Alexa, the website's ranking among all websites increased from 60th to 7th in terms of traffic, from September 2006 to September 2007.[5] It is also the most popular website for uploading photos, with 14 million uploaded daily.[4] Due to the website's popularity, Facebook has met with some criticism and controversy in its short lifespan related to privacy concerns, the political views of its founders, and censorship issues. Facebook is the most popular social networking site in many English-speaking countries, including Canada[6] and the United Kingdom.[7]