China's Internet down for hours Tuesday, probably due to censorship programs

http://www.reuters.com/article/2014/01/22/us-china-internet-idUSBREA0K04T20140122

Initially Chinese news sources claimed the Chinese internet had been hacked, but

Independent tests showed that the source of the malfunction originated from within China, and specifically from the Great Firewall servers themselves.

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The "Great Firewall" refers to China's massive system of technology and human overseers devoted to censoring Chinese citizen's access to websites and information.