Sina Weibo, the microblogging and social media service that's often called China's answer to Twitter and Facebook, has filed documents with the U.S. Securities and Exchange Commission to raise up to $500 million in an initial public offering. Weibo was launched by Chinese online media giant Sina in August 2009. Today, Sina owns a 78 percent stake in the company, with Alibaba holding a minority… Read More
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