Here's what a commenter, DogGunn, had to say (I copy below as I'm not sure it'll stay at the top):
"Article is wrong.
Mark's profile is here: http://www.facebook.com/zuck
And his like page is here: http://www.facebook.com/pages/...
Neither were hacked.
Someone had setup a fake profile at http://www.facebook.com/markzu... and fooled Techcrunch. Facebook fixed by deleting the fake profile."
A quick copy+paste pretty much confirmed it for me.