Great firewall of China - censored terms
AP Photo/Greg Baker
See who showed up at the video game convention in Boston.
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YouTube, Facebook and Twitter
China blocked YouTube in March 2009 after a video showed security forces beating Tibetan protesters. It blocked Facebook and Twitter in July 2009 in advance of the 20th anniversary of the Tiananmen Square crackdown.All three sites have been blocked on and off since. None are currently available in China.