The hook up site, Adult Friend Finder, suffered a data breach. Close to four million users had their data taken. Data included personal details, including email addresses, user-names, dates of birth, postal codes and IP addresses.
Many members did not use details that were good enough to truly hide their identities and are easily found on social networks. Leaving them very susceptible to blackmail attacks. Many Adult Friend Finder members are just looking for a quick hook-up, sometimes married men, looking for a casual gay gang bang without their wife finding out, are perfect targets for blackmail/extortion.
The data from the breach was placed on a forum in the deep web.