This is actually a very interesting analysis. He examines a whole bunch of cofactors that I wouldn't have even thought of. Comment length, word length, common adverbs, common pronouns, punctuation, all caps, swearing (since when is "douchebag" a swear word).

I wonder what would be revealed by this kind of analysis on the entire hacker news respository. Now, that's a large data set. (No, I'm not volunteering :-)