Great firewall of China - censored terms
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In 2006, The Wahington Post obtained a list of keywords used by a Chinese blog service to flag offensive content.
The list included multiple references to 1989 clashes between Chinese protesters and government forces in Tiananmen Square in Beijing, in which hundreds of civilians are believed to have been killed.
A number of related phrases also appeared on a list of banned terms reportedly leaked from Chinese search engine Baidu in 2009. Freelance journalist Jonathan Stray posted a translation of the list on his blog. Among the flagged terms: "1989," "Square incident" and "the massacre of students."