This is likely old news for some, but I just came upon this nifty graphic that I thought I’d share (hat tip to the insightful Online Fandom for sharing the link):
Be sure to avoid the “bay of trolls”. Heh.
Someone ought to make this taggable (I’m looking at you, Plazes)…
(if you can’t see the pic for whatever reason, go to http://imgs.xkcd.com/comics/online_communities.png )