yeah, it's cool right now. but, to get big they are going to have to let the 'unwashed masses' in. Expect more questions like, "why is paris hilton such a sloot?" and less about interesting topics with interesting answers.

Once that happens, and it will have to happen for them to have the number of users that twitter or facebook has it will descend into yahoo answer hell. I don't see how they avoid that and get mass user adoption.