Where does user generated content come from?

Prepping for my CES trip next Monday - meetings with hardware manufacturers, a few publishers and a bunch of ebook and audiobook people that happen to be at the show.  I'll be at Sunplus (Sands 73454), our hardware partner, some of the time.

Interesting post by Tim O'Reilly on Wikipedia - on whether or not it's created by a small group of editors, or by hundreds of thousands of casual content creators. Whether Wikipedia is or not, companies like StumbleUpon or YouTube rely on casual content creators for most of their content. I think that casual content creation is how we're going to have most of our media created, so we should make casual content creation tools as simple as YouTube star recommendations or thumb-up/thumb-down Stumbles.