No credit card data has yet been uncovered as part of the hack.That data is incredibly revealing and potentially damaging.
For example, one person exposed in the hack is a 40-year old welder from a small Illinois town of a few thousand people.
He "will become anybody's slave" and lied about his age on the site, claiming to be 29.
It's one thing when your bank account, your credit card details or your buying behavior at Target get leaked.
It's quite another when your predilection for dressing up as a housemaid while speaking Norwegian and seeking extramarital partners comes to light.
Andrew Auernheimer, a controversial computer hacker who looked through the files, used Twitter to publicly identify Adult Friend Finder customers, including a Washington police academy commander, an FAA employee, a California state tax worker and a naval intelligence officer who supposedly tried to cheat on his wife.
Asked why he was doing this, Auernheimer said: "I went straight for government employees because they seem the easiest to shame." Millions of others remain unnamed for now, but anyone can open the files -- which remain freely available online.
That could allow anyone to extort Adult Friend Finder customers.
For instance, the security consultant Robb reported that one person whose information was hacked was a 62-year-old Hispanic male from New Jersey, who worked in advertising and has a preference for the "subporno" forum.
Suggestions Adult Friendfinder provides for the "tell others about yourself" field include, "I like my partners to tell me what to do in the bedroom," "I tend to be kinky" and "I'm willing to try some light bondage or blindfolds." The hack, which took place in March, was first uncovered by independent IT security consultant Bev Robb on her blog Teksecurity a month ago. It wasn't until this week, when England's Channel 4 News reported on the hack, that Adult Friend Finder was named as the victim.