Eleven Terms You Need to Know to Talk VWs

That's VWs - Virtual Worlds - not the German auto manufacturer. Ren Reynolds at Terra Nova has blogged a short taxonomy of common terms related to virtual worlds. The post is followed by some interesting comments(one with a link to a similar list made in 1999! - historical). The terms are: Game World, Metaverse, MMORPG, MMO, MOO/MUSH, MUD, Synthetic World, Social World, Thick Social World, Thin Social World and Virtual World. Do you know the differences?