<i>What follows is a pretty standard lament about online communities</i><p>In my personal experience, the comment sections I've found on any web site eventually fall into three painful and unsatisfying categories:<p>- Ghost towns: the blog or forum has so little audience, nothing gets said.<p>- Worthless hole: enough people have become involved that there is no way to have a discussion without trolls trying to derail the conversation.<p>- Benevolent (or not) dictatorship: moderation is strictly enforced to keep things civil.<p>There's often a period shortly after the Ghost Town attracts an audience, where an open forum may seem to be doing ok. But once it gets popular everything falls apart and moves into the Worthless Hole. I'm waiting nervously for this to finally happen to HN, as the community moderation doesn't seem strong enough to prevent it.<p>The strict moderation model seems to work in a lot of places (I particularly enjoy Scalzi's blog, and the Loving Mallet of Correction), but I'm not sure it accomplishes a real discussion of opposing views... It works better in settings where all conversations are one-sided or at least light-hearted.<p>I do occasionally find a mathematics blog or something which has a good stable of commenters and fun discussions, and persists for years. Maybe the secret is to confine your community to a small enough niche that the trolls are never attracted?