One of our users got nuked yesterday! What does it take to get banished by Fluther?

Yesterday I responded to a question by a certain user. I wanted to grab part of that response today to copy the quote, but it was nowhere in my list of responses. A bit of checking and I found that not only is the question gone, the user is no longer on Fluther. I had to wonder what it takes to get yourself banished to Outer Slobovia. Anyone know what limits we are never to cross?