A man visits Sina's Weibo microblogging site in Shanghai

 
A man visits Sina
A man holds an iPhone as he visits Sina's Weibo microblogging site in Shanghai May 29, 2012. China's Sina Corp has introduced a code of conduct for users of the local version of Twitter amid accusations of censorship to rein in what has grown into a raucous online forum to air political and social grievances. The code of conduct, first announced earlier this month, stipulates that users of Sina's Weibo microblogging site cannot post information that is against the principles of the constitution, cannot harm national unity, disclose state secrets or publish false information, among other rules. REUTERS/Carlos Barria (CHINA - Tags: MEDIA BUSINESS TELECOMS)