170M accounts from Adult FriendFinder (2016) (adultfriendfinder.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In October 2016, the adult entertainment company Friend Finder Networks suffered a massive data breach. The incident impacted multiple separate online assets owned by the company, the largest of which was the Adult FriendFinder website alleged to be "the world's largest sex & swinger community". Exposed data included usernames, passwords stored as SHA-1 hashes and 170 million unique email addresses. This incident is separate to the 2015 data breach Adult FriendFinder also suffered. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)