In the summer of 2010, Facebook announced that it has over 500 million active users around the world.About half of them use the site every day. About 70 percent of all Facebook users are in countries outside the United States.

　　Mark Zuckerberg and his friends started Facebook in 2004 when he was a second year student at Harvard University in Massachusetts. He began the project by illegally using the university's computer system.

　　Harvard University charged him with breaking several laws. Mark Zuckerberg was almost forced to leave school. But the university withdrew the charges. Mark Zuckerberg was also accused of stealing other people's ideas and using them in Facebook. He has denied (否认) the charges.Several people have taken legal action against him.

　　At first, only Harvard students could use Facebook. But it quickly expanded to other universities. The website was also opened to high school students. Now, anyone at least 13 years old with an e­mail address can join.

　　In the early days, only a small group of people managed Facebook. Now it has over 1,700 workers in 12 countries.

　　Facebook makes money by selling advertising. It has been extremely successful.

　　The financial company SecondMarket, says Facebook is worth 41 billion dollars.

　　A movie about the creation of Facebook, called “The Social Network”， was released in October 2010.

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