Some forums add some kind of non-linearity by adding comments to posts this way you have linear main topic and offtopic "sub topics" in comment chains under po

Some forums add some kind of non-linearity by adding comments to posts this way you have linear main topic and offtopic "sub topics" in comment chains under posts. But I think that tree has some cons, namely - it creates/allows to have many sub discussions in one thread, meanwhile forum's linear model force everybody to follow the same discussion instead of groups. It depenends when one model is better than the other - in thread called "Linux vs Windows" tree is better, because there's going to be a lot of sub discussions, but in technical thread I'd rather have linearity. >Forums ain't it - of the ones I've been on, all considered replying to a week-old conversation as "necroposting"[4]. It's up to the community. I've seen it done healthly e.g decade old posts are in fact "necroposting", but one year old not.