I always appreciate what moot has to say, and I think he's absolutely correct about anonymity creating a stage in which it's fine to fail publically. There's almost no judgement based on past efforts, which means that you can frequently see new ideas pop up. This is especially true of the boards with topics, which tend to have smaller communities than the random board, allowing for more effective meme propogation. Fo…
Regarding your anecdote: IMO it works for 4chan because the entire system is built around anonymity and a troll culture. If every message on 4chan is a trolling opportunity but every user is anonymous, trolling looses a lot of it's 'fun'. You get no notoriety, the target is primed for it already and is protected by their own anonymity. Trolling on 4chan has been elevated to such an art-form that it takes more energy…
I don't think you need anonymity to make trolling lose its flavor, I have used plenty of forums over the years where there were persistent identities but the sophisticated (compared to twitter users) forum members just didn't take the bait and trolling attempts usually just fell flat.