Fetching the friendlist on Facebook not using an API - Objective-c

Question

I want to get the list of my friends on Facebook that are not using an application. I know this is possible because it's been done in the Hackbook. However, after mind-boggling research on Facebook Developer documentation and the code for Hackbook, I am not able to find any particular way to go ahead. Any hint or help will be really appreciated.

Answer 1

Access /me/friends?fields=installed with your user's access token. Any of their friends who also use your app will have an 'installed: true' entry in the response