996K accounts from Little Monsters (littlemonsters.com) 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 addressesPasswordsUsernames
In approximately January 2017, the Lady Gaga fan site known as "Little Monsters" suffered a data breach that impacted 1 million accounts. The data contained usernames, email addresses, dates of birth and bcrypt hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)