[bkaid]

I've seen a study that shows this isn't true, especially when prompting for offline_acces. Wish I could find the link. Also, Facebook's app analytics shows you the break down of how often permissions are rejected and from what I've seen with high usage, the permissions prompted did matter. I would disagree that you should just ask for ones you might not need, especially since you can always prompt the user later for more if needed.

[idoh]

I'm looking at the Facebook Insights for the app right now. The bucket where we asked for the most permissions (excluding email) performed significantly better than the other options. I don't know why that is the case, but it is.

As for asking for permissions later, since it doesn't seem to matter we ask for all the ones we need up front. We've found that gradually asking for permissions as needed annoys the user and breaks up the app flow.

[rhizome]

it may be consumer psychology: more permissions means your app must have more functionality.