Comment censorship

I want your views on how much control I should exert over the comments that people make here. I’ve been led to thinking about this by a couple of things. Mostly by the occasion of the first troll comment on this blog, and to a lesser extent by Shaan Hurley turning off comments on posts older than three months on his Between The Lines blog. (I am not complaining about this; it’s Shaan’s justifiable reaction to mass spam attacks and it has nothing to do with censorship. There are some Autodesk blogs that don’t allow comments at all, which may …