Perhaps the most important part of creating an effective environment for content-sharing is to ensure that everyone whose material is used in a collaborative work receives a fair share of whatever revenue the composite work may generate, whether from advertising or from pay-per-click charges.  Specifically, what is needed is a simple, fair, and equitable system that everybody understands and agrees to as a precondition of making content available on the system.

Once this is established, administering the system and apportioning out earnings is a function that can be readily performed by the same entity that incents people to categorize and recommend content.