Duo is intended to be a new kind of discussion format. It's somewhere between chat, IRC, and threaded forums. We've had a couple hundred people check it out, b

Duo is intended to be a new kind of discussion format. It's somewhere between chat, IRC, and threaded forums. We've had a couple hundred people check it out, but over the last day or two (not that many people at once). How many people are needed for a social site to feel interesting? My guess is that it only takes a good handful (maybe 25 or so) to kick things off and encourage growth. Or is it a crazy idea to do something social without jumping on the back of the other social mega services?