I'm not saying this app is entirely a bad idea. I had Zuckerberg telling me for 20 minutes that this site is awesome. I just became ridiculously bored after the first week of using it and I'm concerned the founding team isn't gaining real-life perspective as to whether or not the idea is any good.
Perfect example: Someone asked a question the other day "What does Max Levchin look for when hiring", and guess who responded to the question? You guessed it, Max Levchin himself. In the real world, this wouldn't happen and as the user population grows, the celebs roll out and the people looking for questions about brushing their dog's teeth roll in. I don't see the value beyond it's current elitist state.