I’ve found some great value after I read Collective Knowledge Systems: Where the Social Web meets the Semantic Web By Tom Gruber.
You can find more about him at TomGruber.org or look for his .pdf download. He has a few figures discussing collective knowledge system and the like. Another I would suggest is MIT they published MIT_CollectiveIntelligence2009.pdf I’m sure you can search both and download easily. Enjoy Collective Intelligence: Humanity’s Mass Mind & let me know your thoughts!