We've been working on a similar idea for a few years now. We have a distributed version called P2Pedia: http://www.nmai.ca/research-projects/universal-peer-to-p

We've been working on a similar idea for a few years now. We have a distributed version called P2Pedia: http://www.nmai.ca/research-projects/universal-peer-to-peer/p2pedia http://www.nmai.ca/research-projects/universal-peer-to-peer/... and a centralized version as a Moodle plugin called Social Wiki: http://www.nmai.ca/research-projects/socialwiki http://www.nmai.ca/research-projects/socialwiki You can try out Social Wiki online (there's a link to a demo site on the above link). The UI needs work, but I'd say Social Wiki is functional. Just need to install Moodle first.