4Chan is probably not the best choice of a site to emulate in this context; it's clearly extremely successful at community-building, but its values concerning discussion could hardly be more different from ours. Describing it as "trolls trolling trolls trolling..." is almost a cliche, and one more or less borne out by my limited experience with the site.

On the other hand, I'm certain that the "don't feed the troll" meme predates it considerably.