3.9M accounts from Kaneva (kaneva.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 July 2016, now defunct website Kaneva, the service to "build and explore virtual worlds", suffered a data breach that exposed 3.9M user records. The data included email addresses, usernames, dates of birth and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)