Here's an interesting read about Disney's new MagicBands. There are some privacy concerns, it seems.

http://gigaom.com/2014/01/18/you-don...ace-data-race/

An excerpt: "What does Disney get out of the deal? In short, it tracks everything you do, everything you buy, everything you eat, everything you ride, everywhere you go in the park. If the goal is to keep you in the park longer so you’ll spend more money, it can build AI models on itineraries, show schedules, line length, weather, etc., to figure out what influences stay length and cash expenditure. Perhaps there are a few levers they can pull to get money out of you."