Diablo 3 account compromises are currently happening and there are a string of accusations kicking around from the victims of these attacks. Fingers are being pointed at Blizzard and at each other.
The vast majority of these incidents, in fact close to 100%, are occurring where the victim not having an authenticator attached to their battle.net account.
Blizzard has published a lengthy statement on the issue and have confirmed that they are seeing an increase in account compromises.
Read the full articule
and learn how to best protect your gaming account.