Clay Shirky on the four primary factors motivating participation

There *is* a lot of interesting science on motivation, and it shows that it's not as simple as "dangle the carrot and they'll chase it". I don't have time for a more thoughtful response right now... but I think *every* recommendation area has challenges and contradictions. They key is threading the needle: can we get the good parts of the recommendation, and navigate around the pitfalls?