A man holds an iPhone as he visits Sina's Weibo microblogging site in Shanghai in this May 29, 2012 file photo. Sina Corp, one of China's biggest Internet firms, runs the microblogging site, which has 500 million registered users. It also employs the censors. The Sina Weibo censors are a small part of the tens of thousands of censors employed in China to control content in traditional media and on the Internet. Picture taken May 29, 2012. REUTERS/Carlos Barria/Files (CHINAMEDIA - Tags: MEDIA BUSINESS TELECOMS)
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