When you add a Facebook application, it has access to nothing until:
1) the application pops up a dialog box to ask you for specific permissions
2) you agree to those permissions
Most apps will ask for "Basic Information" which is: name, profile picture, gender, networks, User ID, list of friends, and public information (any information you've made public / open to everyone).
If you want to see information available about you through our Graph API, ht tps://graph.facebook.com/[User ID or Username]?metadata=1 just type into your browser.
For me it comes up "false" since none of my info is set for public or open to everyone. You can check your own if you have a facebook account.
So as long as facebook gives users a page for "privacy setting" and lets you use it effectively..I will stay with facebook.