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"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 If Leaked Source's claims are confirmed, the number of e-mail addresses would account for more than 10 times the number exposed in last year's high-profile hack of infidelity website Ashley Madison.
Former employees of the company have claimed that this is their standard policy and not the result of errors.
The breach included 300 million Adult Friend Finder user accounts, including account data for 15 million accounts that had supposedly been "deleted".
The passwords had not been encrypted at all, or encrypted with the obsolete and insecure SHA-1.
Accessing certain features, such as e-mail, private chat rooms, webcams, blogging, and a webzine, requires paid membership.
Adult Friend Finder has an affiliate program, whereby webmasters are compensated for referring users to the site.