Recent rumors that Bungie.net has been hacked, and that your personal data has been compromised or stolen, are utterly false. Bungie.net has not been hacked, and frankly, there's nothing to hack. Bungie.net's database does not contain any of your personal information other than your Gamertag and Halo 2 stats.
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I have a feeling that the people who are getting thier gamertags stolen are in the same group of people that post the "OMG MY GROUP WAS TAKEN OVER" threads.