Because all coffees and their connoisseurs aren't same - apps would eventually require a movie director - movies would eventually require an app developer ============================================ Having a private dinner without any data trace would be an expensive affair. People would pay extra to go to a place with no cameras, no tracking, no payment traces, Maintaining perfect privacy also requires data! What if one of your acquaintances is visiting the same place you have gone to. It would help to know who all you know and if they are really away from you. I imagine a service which takes a list of your social contacts and suggests places where any of them are unlikely to visit in the time you choose. for celebrities, that can mean a place where they are completely unknown. One can keep extending the notion of privacy to the level where user doesn't want to see anyone from their country. The problem of finding completely dissimilar people is tougher than...