[Reuters] Alibaba buys 18 percent stake in Sina's Weibo for $586 million - 04/29/13 12:54 PM
(Reuters) - Sina Corp, China's largest Internet portal and media website, said e-commerce company Alibaba Group has bought an 18 percent stake in its microblogging service Weibo for about $586 million, valuing Weibo at more than $3 billion.