5.97M accounts from xat (xat.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 addressesPasswordsUsernamesWebsite activity
In November 2015, the online chatroom known as "xat" was hacked and 6 million user accounts were exposed. Used as a chat engine on websites, the leaked data included usernames, email and IP addresses along with hashed passwords.
Source: Have I Been Pwned (CC BY 4.0)