"Friend Finder takes the security of its customer information seriously and is in the process of notifying affected users to provide them with information and guidance on how they can protect themselves," Friend Finder said in the statement.
"Our investigation is ongoing but we will continue to ensure all potential and substantiated reports of vulnerabilities are reviewed and if validated, remediated as quickly as possible," it said.
The site can then check whether your details have been leaked or not.
However, it's still far from definitive, and your details could have still be leaked even if they return no matches.
Among the information lie details that are better left unsaid.
Apart from demographic data such as IP addresses, usernames, passwords and comments, the hack also exposed details about sexual preferences and intentions for affairs.
He said Treanor, of Exmouth, was ‘immature and bored’ and unhappy at the time he started doing this when he was a teenager.