19.9K accounts from MyVidster (2015) (myvidster.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In August 2015, the social video sharing and bookmarking site MyVidster was hacked and nearly 20,000 accounts were dumped online. The dump included usernames, email addresses and hashed passwords.
Source: Have I Been Pwned (CC BY 4.0)