If anyone is interested in seeing such a application in a fictional setting, I suggest the anime Death Note, if nothing else for its entertainment value. For those who are familiar with the story, the questions L asked in order to narrow down Kira suspects to a limited demographics in a small region in Japan, among billions of candidates, were some good ones. A good article that analyzes the plot from a information theory perspective: [http://www.gwern.net/Death%20Note%20Anonymity](http://www.gw....