One of the fascinating aspects of any user-generated-and-shared experience is that community forms. From original forums hoping to foster community to blog posts where folks live in comments to the rise of wikis and the the communities there, to the current optimization of "social networks", what makes the content good is the community who is willing to contribute to it. Just a pure "look for questions and answer them" will fail, and has over and over again, even with payment/bounties for answers, unless a community can form that takes pride in sharing knowledge, keeping things accurate, and trying to help. And once it declines, as these things can, into arguments from the louder voices, then the community suffers... and so does the quality of content moving forward.

So, without community, you wouldn't have the answers, and without the answers, folks stop asking the questions.