He actually interrupted Tony Hsieh in mid-sentence in the middle of his talk, and with an obviously stupid question that Tony shot down without really missing a beat: "What specifically do you ask people in interviews to see if they're egotistical?"
A few minutes into Zuckerberg's talk he started raising his hand, and then spent the remainder bouncing up and down in his chair. From all that buildup I expected him to ask a confrontational drama-queen non-question about Friendfeed, but instead he nervously asked a nonsense question about how he's managing his employees as he wanders their offices. It seemed to me that it was some veiled drama, or something only a company-tour addict would give a shit about.
In one of the later talks someone thankfully took the microphone back from him before he could try to ask another question after the final one (he was standing and approaching the stage!)
At first I was thinking that he should be actively disinvited from future events, but I had a long productive conversation with him afterwards (though not about his recent asshattery, his face is pink enough as it is). I've come to the conclusion that his presence is useful, but that he should never be allowed to ask questions — the best that could happen is irrelevant softball non-questions that waste everyone's time.