It's not a pipe dream. There are some folks out there working on this kind of stuff, and I prototyped one for my master's project. However, I didn't go the rout

It's not a pipe dream. There are some folks out there working on this kind of stuff, and I prototyped one for my master's project. However, I didn't go the route of having propositional-level granularity, because I'm aiming for Wikipedia levels of participation, and it's understood in HCI that the more structure you impose on input at the interface level, the lower the adoption. Some stuff you may want to look up (all but the first are actually online): MIT's Collaboratorium (should be an article in Sloan) DebateGraph TruthMapping DebateWise Debatepedia There are also a bunch of other more commercial attempts whose names I can't recall. ReadWriteWeb or a similar site did a roundup of them last year. But they suck. Even the listed examples have probems insofar as they screw up the interface, interaction design, and/or information architecture. (That is, if the goal is to achieve widespread use.) Within small, interested communities, there may be sufficient motivation to use them. In Collaboratorium's case, they had a class at MIT use it w/r/t climate change. If you're really interested in tackling this problem, let me know. I'm too busy working on a for-profit venture to keep developing my MS project, but my design doc might give you some ideas, even if you don't go the route I did.