Sina Weibo (NASDAQ: WB) is a Chinese microblogging (weibo) 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 market penetration similar to the United States' Twitter. It was launched by SINA Corporation on 14 August 2009, and as of December 2012 has 503 million registered users.
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