An anonymous reader writes "Two message boards devoted to the same topic have each been on-line for roughly eight years. One is censored, and the other is not. The two forums are virtually the only ones devoted to their topic (polygraph testing, a fairly arcane one), so they're in "competition" only with each other. The result? The uncensored forum has more than six times as many posts as the censored one."
To be fair, there are a few other differences between the two forums, but the point may still be valid.