1. What makes this different from Twitter?<p>2. I'm tired of invites to 'join the conversation'. I have yet to have a good conversation with a large crowd of random strangers; otherwise rush hour on the subway would be an intellectual feast. Robinson's law: As the number of participants in a conversation increases, the collective IQ asymptotically approaches that of the dumbest participant. Markets function because people have to <i>act</i> by making specific trades and other participants must try to infer what reason lay behind the behavior. The more participants in a market talk to each other, the higher the likelihood that they will fall victim to a collective delusion.