Blizzard have admitted that they were hacked, and some sensitive information was compromised by the hackers (they now have my email address, but I guess things could be a lot worse). Blizzard have posted an FAQ, which includes How did this happen?
Like all companies doing business online, it is not an uncommon occurrence to experience outside parties trying to illegitimately gain access to the operation’s structure at some level. We are continually upgrading our security technologies, policies, protocols and procedures to protect our customers and our games against the threats that increasingly arise in today’s online world.
Is it just me, or did they completely fail to answer their question?