I had an idea for a website with community driven content.  Someone would post a rumor or something unconfirmed and people would either simply "confirm it" or add evidence and such to support or invalidate the rumor.  I'd compare it to a cross with snopes.com and mythbusters.  You could have different user rankings for how much they've contributed and maybe for a rumor to move to a status of "confirmed" it would need to be confirmed by an established member or authority.  Eventually, as the community grew, I think we'd form quite a thinktank full of valued people.