Larry Hryb, Director of Programming for Microsoft Xbox LIVE, had his account hacked the other night by a website, or at least a member of, lightzz.com - they feature a video of their work on Larry's profile and also claim credit for it.
Amongst other things that were posted to his online bio, above is a screenshot of some of the milder content. It seems the attack was targeted specifically at Larry due to his popular status in the Xbox Live community.
Larry told gaming website Kotaku I have control of the account, the enforcement team took care of it. - the enforcement team are also investigating this further to also ensure it cannot happen to other peoples accounts.