china social sina weibo

Company: Sina

Number of users: 368 million

Who they are: Educated user base, first-tier cities

What users do: Publish and share short bursts of celebrity gossip and breaking news

- Last updated September 10 2012 07:11 AM ET
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Never mind the $16 billion in the bank, the poster child for botched IPOs could have saved itself all sorts of grief by staying private.

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