Traditional knowledge: the dilemmas of sharing: http://thackara.com/learning-design/traditional-knowledge-the-dilemmas-of-sharing/
This is why even a wiki would not be the complete answer. Wikis may be peer-to-peer, but they are still media, rather than the real thing. In terms of media platforms, some kind of Yellow Pages or Craig’s List, that connects people who need to know, with people who can help them, is the more promising way to go. Such a person-to-person connection machine would be even more powerful if it were to incorporate user ratings of the knowledge suppliers involved.