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Sina Weibo (NASDAQ: WB) is a Chinese microblogging (weibo) website. Launched by Sina Corporation on 14 August 2009, it is one of the most popular social media platforms in China. As of Q3 2018, Sina Weibo has over 445 million monthly active users, with surging stocks, advertising sales, revenue and total earnings in the quarter. At the start of 2018, it surpassed US$30 billion market valuation mark for the first time.In March 2014, Sina Corporation announced a spinoff of Weibo as a separate entity and filed an IPO under the symbol WB. Sina carved-out part 11% of Weibo in the IPO, and Alibaba owned 32% post IPO. The company began trading publicly on 17 April 2014.