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- Sina Weibo 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. By the third quarter of 2015, Sina Weibo has 222 million subscribers and 100 million daily users. About 100 million messages are posted each day on Sina Weibo.In March 2014, Sina Corporation announced a spinoff of Weibo as a separate entity and filed an IPO under the symbol WB. Sina retains 56.9% ownership in Weibo. The company began trading publicly on 17 April 2014.Name"Weibo" is the Chinese word for "microblog". Sina Weibo launched its new domain name weibo.com on 7 April 2011, deactivating and redirecting from the old domain, t.sina.com.cn to the new one. Due to its popularity, the media sometimes directly uses "Weibo" to refer to Sina Weibo. However, there are other Chinese microblogging/weibo services including Tencent Weibo, Sohu Weibo, and NetEase Weibo.HistoryAfter the July 2009 Ürümqi riots, China shut down most of the domestic microblogging services including the first weibo service Fanfou. Many popular non-China-based microblogging services like Twitter, Facebook, and Plurk have been blocked from viewing since then. Sina's CEO Charles Chao considered this to be an opportunity. SINA Corporation launched the tested version of Sina Weibo on 14 August 2009. Basic functions including message, private message, comment and re-post were made possible in September 2009. A Sina Weibo–compatible API platform for developing third-party applications was launched on 28 July 2010.
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