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The popularity of Twitter has produced a number of clones in China, just as there are Facebook clones. Some of China's Twitter clones have been closed down by the Chinese government, but some have survived.
Since the closure of Twitter, Fanfou, Jiwai and Digu, other services have risen to take their place. Taotao (owned by the company that produces popular IM service QQ) and Zuosa.com are two examples.
However it is Weibo that has emerged to become the biggest micro-blogging service in China. It's owned by Sina.com, a big portal company in China.