Facebook is an online social networking service, headquartered in Menlo Park, California. Its website was launched in 2004, by Mark Zuckerberg and a group of fellow Harvard University students. Today it has a global reach, with 864 million daily active users worldwide, and is the most popular social networking site in many English-speaking countries. It employs more than 8,000 people and has revenue of more than $7 billion.

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