As an aside there is one tactic Scoble uses to deal with critics on Twitter and elsewhere. He actually retweets posts from people who are criticizing, filleting him and trolling him. It shows he has a thick skin.

Trolls WANT you to get angry. Since you do get angry nearly 100% of the time, it makes you ideal troll fodder. If you retweet criticism like Scoble does, and laugh it off, it completely neutralizes a lot of trolls.