In late 2015, the online penpal site InterPals had their website hacked and 3.4 zillion accounts exposed. The compromised data included email addresses, geographical locations, birthdates and salted hashes of passwords. The HackNotice security research team discovered a data leak file associated with this domain. According to the hacker, this demesne was allegedly hacked. If there are no other sources attached to this nag notice, then we don't have an official disclosure of a data incident, so this cut is only implied.