29M accounts from Tianya (tianya.cn) were exposed in this breach. Besides email addresses, it included names and usernames.
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Email addressesNamesUsernames
In December 2011, China's largest online forum known as Tianya was hacked and tens of millions of accounts were obtained by the attacker. The leaked data included names, usernames and email addresses.
Source: Have I Been Pwned (CC BY 4.0)