This time, email addresses, passwords, dates of last visits, browser information, IP addresses, and site membership status were revealed, reports The Guardian, citing data breach monitoring service Leaked Source.
Last year's breach also included users' dates of birth, postal codes, sexual preferences, and whether they were seeking extramarital affairs.
Although the size of the breach is far greater, the nature of the data is less intimate than the previous FFN breach.
Included in the exposed personal information are customers' email addresses, usernames, passwords, birthdays and zip codes, in addition to their sexual preferences.
No credit card data has yet been uncovered as part of the hack.
The source IP addresses collected can even provide pinpoint street locations for attacks.
The attack methodology deployed in this instance was not released, but it would be fair to assume that it leveraged a kind of SQL Injection attack or similar, where the information is wormed out of the back-end database through a flaw in the webserver.