A user named "Wakow" who claims to run "9th level security for NASA" claims to have had his Diablo III account hacked. He admits to not having a Blizzard authenticator and instead uses "lexil security pathways" and that his every connection is "closely monitored" by NASA security.
It's an amusing read, and it shows the lengths to which some users will attempt to troll others in the gaming community. You can read it below:
Blizzard recommends that its users in Diablo III, Starcraft II and World of Warcraft pick up its Authenticator to protect their accounts and never give their passwords out or share their accounts with anyone else. The developer says that most players get their accounts "hacked" after using third party software with these games.