270K accounts from MajorGeeks (majorgeeks.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 November 2015, almost 270k accounts from the MajorGeeks support forum were breached. The accounts were being actively sold and traded online and included email addresses, salted password hashes and IP addresses.
Source: Have I Been Pwned (CC BY 4.0)