I've given my answer to the freeriding problem above: upfront payment, moderation, rep systems... Re: 100 people answering the same questions: I don't think th

I've given my answer to the freeriding problem above: upfront payment, moderation, rep systems... Re: 100 people answering the same questions: I don't think that would be that big a problem, because questions are going to be specific. Take my use case scenario: at any given point on Twitter, there might be 100 people willing to answer questions about restaurants in Paris -- but about sushi places in a specific neighborhood? Much less likely.