960K accounts from FreeOnes (freeones.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In February 2017, the forum for the adult website FreeOnes suffered a data breach that was later redistributed as part of a larger corpus of data. The data included 960k unique email addresses alongside usernames, IP addresses and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)