Ashley Madison
After some months of hesitation, the hacked data of around 32 million Ashley Madison users was ultimately released by the enigmatic hacking group The Impact Team.
The leak included names, phone numbers, addresses, member profiles, as well as credit card details and records.
The Ashley Madison leak was followed by an exhaustive extortion campaign in which many victims of the breach were tricked into paying scammers cash in exchange for secrets that would supposedly damage their reputation.
There’s an excellent TV documentary that chronicles how the Ashley Madison hack unfolded, also detailing the subsequent scandals that blew up afterwards.