I have written about this whole thing quite a lot already, but I have some new insights based on things I have witnessed recently.
We know that extrinsic rewards are meant to demotivate people when doing anything that is even slightly creative. So why do we keep seeing them being used in gamification and marketing. On the face of it, that kind of thing works well. Offer a reward and ask people to do something simple. Like this, follow that, +1 the other and you can win a book. Low and behold you can get hundreds or thousands of these clicks – great. The question is, how many of these are valuable? What is the goal? If you are trying to develop new and worthwhile interactions and relationships. Does the same person liking everything you have ever written, just to win the prize, have any actual value long term?