Grant less permission of "Access my basic information"

The basic information is determined by Facebook, and we have no control over those permissions. Those are set by Facebook as the minimum set of permissions required for a user to allow an application access to their profile.

As for the profile data permissions, right now, we don't have an easy way to look up what permissions these would be. It's all based on how you've mapped a user's Facebook profile to the social extension(s) on your site. If you haven't mapped any fields, then no additional permissions would be required. If you, for instance, wanted Current Location - City, the Current Location permission would then be required. You can see the currently requested permissions when you try to login. If you've already granted permissions, in Facebook, you can remove your pages application and log in again. Your Joomla account won't be deleted during this process, but it will let you see the permissions request box again.

Hope that helps,
Alex