745K accounts from Android Forums (androidforums.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesHomepage URLsInstant messenger identitiesIP addressesPasswords
In October 2011, the Android Forums website was hacked and 745k user accounts were subsequently leaked publicly. The compromised data included email addresses, user birth dates and passwords stored as a salted MD5 hash.
Source: Have I Been Pwned (CC BY 4.0)