USA TODAY -- June 3 -- Online users in China said Twitter, Yahoo's Flickr photo site, Microsoft's new Bing search engine and Hotmail, and other services were inaccessible on Tuesday. This week marks the 20th anniversary of the bloody military crackdown on pro-democracy protesters at Tiananmen Square. Social media experts suspect Chinese authorities may be blocking sites to tamp down discussions of the protest. The Chinese government has not issued an explanation.
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