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It provides services mainly through Sina.com (online news and content), Weibo.com (microblog) and Sina Mobile.
FORBES: Sina Can Weibo Its Way To $67 Despite Being Cautious On Ad Spending
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Hong Kong's Apple Daily notes that Sina Weibo, a microblog service, temporarily blocked searches for keywords such as "Zhu Ling", "Sun Wei" and "thallium poisoning" last week.
BBC: China media: Middle East mediation
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Officials are attempting to make these tasks more manageable by requiring that users of the most prominent microblog service, Sina Weibo, register using their real name and identity-card number by March 16th.
ECONOMIST: The power of microblogs
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This year, Sina named Yao queen of the microblog when she surpassed the number of followers of Oprah Winfrey in January.
FORBES: China Actress Has More "Twitter" Followers Than Obama, Katy Perry...
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They ordered the two most popular microblog services, operated by Sina and Tencent, to impose a three-day ban on one of their most popular user functions the ability to comment on others' posts. (Each service has more than 300m registered users.) And they arrested six microbloggers, some prominent, for spreading rumours.
ECONOMIST: Uncertain politics