Down And Out in the Magic Kingdom, by Cory Doctorow:

This future history book takes place in the 22nd century, mostly in Walt Disney World. Walt Disney World Disney World is run by rival adhocracies, each dedicated to providing the best experience to the park’s visitors and competing for the Whuffie the guests offer. In the post-scarcity world of the novel, Whuffie is a currency-like system that primarily measures the esteem of others, or in the case of extremely low Whuffie, their disdain.