A page on the Sina social network site Weibo
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Facebook 'unlikely to crack China'

China's largest internet portal Sina Corp has posted a loss for the first three months of 2012.

Sina operates the popular microblogging site Weibo, which has 300 million users in China.

It's believed that US social network giant Facebook may attempt to crack the Chinese market in the next few years, despite being inaccessible there at the moment.

But Michael Clendenin from RedTech Advisors in Shanghai says it may struggle against incumbent sites like Weibo.