Also, some comments stimulate interesting sub-threads. In cases where something is voted way, way down but has positive responses, it's probably trolling; posit

Also, some comments stimulate interesting sub-threads. In cases where something is voted way, way down but has positive responses, it's probably trolling; positive with a lot of positive responses could mean "thought-provoking". Of course, the real trick is to encourage interesting discussion and not just an echo chamber...