Funny you say that, because iOS already has all these little options. What's better, apps still get installed and users don't have to make this decision upfront

Funny you say that, because iOS already has all these little options. What's better, apps still get installed and users don't have to make this decision upfront. When permission is required for the first time, dialog box pops up, and then you can refuse each permission individually - i.e. you can give Facebook access to location so you can check in, but block access to contacts.