1000K accounts from HongFire (hongfire.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 addressesIP addressesPasswordsUsernames
In March 2015, the anime and manga forum HongFire suffered a data breach. The hack of their vBulletin forum led to the exposure of 1 million accounts along with email and IP addresses, usernames, dates of birth and salted MD5 passwords.
Source: Have I Been Pwned (CC BY 4.0)