Sina Weibo is a Chinese microblogging website. Akin to a hybrid of Twitter and Facebook, it is one of the most popular sites in China, in use by well over 30% of Internet users, with a similar market penetration that Twitter has established in the USA. It was launched by SINA Corporation on 14 August 2009, and has 368 million registered users as of mid 2012. About 100 million messages are posted each day on Sina Weibo.
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People are less happy on days when the air is more polluted, according to an analysis of 210 million posts on the Chinese ...