Of course he does. I know people who have had their content removed, not because of misconduct but because it completely contradicted Beck's revisionist history. He leaves those that respond completely emotionally without sources, etc. But he will often remove content that his audience isn't equipped to discuss.
He treats his radio show and tv show just like he does his forum. He will purposefully screen those that he would to truly engage in debate with and let those that either praise him or sound like quacks right through. They all do this; Hannity, Ingrahm, Rush. Why do you think they are so scared of the Fairness Doctrine?
An aquaintance of mine was a big fan of Beck, not worshiper like you but a big fan nonetheless. This person happens to also be a minister. He was livid when Beck made his "social justice" comment, and then proceeded to do a whole show dedicated to the topic. So this huge fan and person who studied theology most of his life tried calling his radio and TV show for days and was denied because Beck wouldn't have been able to debate the man. He no longer listens to Beck and says there were other ministers that tried to call in and were denied as well.
So yes he censors, it's the only way shows like this work.