612K accounts from ThisHabbo Forum (thishabboforum.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 2014, the ThisHabbo forum (a fan site for Habbo.com, a Finnish social networking site) appeared among a list of compromised sites which has subsequently been removed from the internet. Whilst the actual date of the exploit is not clear, the breached data includes usernames, email addresses, IP addresses and salted hashes of passwords. A further 584k records were added from a more comprehensive breach file provided in October 2016.
Source: Have I Been Pwned (CC BY 4.0)