The goal is to provide full privacy for users so it would be impossible to understand who is the author of content, his location, preferences or wether two users have communicated. How much would that cost and who is capable of doing this kind of work?
I currently host the backend of iOS apps for a client. I can forward you to the app developer who is also an iOS Development Guru (Recently featured by Techcrunch). I'm the host/Sysadmin for the backend of the apps but he will be able to answer the type of questions you have.