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Facebook is one of the most popular social networking (1) ________ in the world, allowing users to contact each other, (2) ________ news, send (3) ________ messages and keep in touch in many other ways. The site was founded in 2004 by Mark Zuckerberg, a computer science student at Harvard, and his college roommates. At first, the site was only available to Harvard students but since 2006 Facebook has been open to all: anybody thirteen years old or older with a valid email address can (4) ________ the site. The site has been developed constantly ever since and new (5) ________ are added regularly. In 2010 Facebook had around 600 million active users and its value had been estimated at over $40 billion. Facebook has had some problems, however. The (6) ________ has been criticized in the past for not protecting the (7) ________ information that users include in their (8) ________ and it has been blocked by numerous countries at different times for political and religious reasons. The site is also often (9) ________ by companies worried at how much time their worker spend (10) ________.

1. A. webs B. sites C. pages D. portals
2. A. post B. write C. type D. message
3. A. instant B. lightning C. short D. fast
4. A. find B. open C. access D. see
5. A. elements B. features C. offers D. parts
6. A. producer B. company C. secret D. personal
7. A. particular B. special C. status D. groups
8. A. block B. blocking C. blocked D. blocks
9. A. connected B. crashed C. type D. networked