433K accounts from Acne.org (acne.org) 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 November 2014, the acne website acne.org suffered a data breach that exposed over 430k forum members' accounts. The data was being actively traded on underground forums and included email addresses, birth dates and passwords.
Source: Have I Been Pwned (CC BY 4.0)