It might be borrowed, but this is the first time I have seen it. I have a history with chat services going back to AOL, irc(mIRC), Mplayer, Firetalk, Paltalk, and even the 3D avatar programs like Holodesk, Activeworlds, and Worlds. They have all contributed something to community building (along with forum sites, which I won't list here), but I have not seen an interactive site where people can go from one area to the next. There is one exception, a site with a green interface had something which mentioned this idea kind of. I think it was called a waiting room, but the tools and buttons were so archaic looking that I didn't bother staying on that site.
Feel free to share where it is borrowed from.