I've had much the same query from a whole bunch of people who checked out my Facebook app. The permission box asks for:
How much of this is actually necessary? It's putting people off allowing permission, especially passing on friends' information; and I can understand that. Is that a default unchangeable Facebook permission box? I can't see it all being needed to make the app work; and people are pretty sensitive about Facebook privacy issues these days.
Your e-mail address
Your profile info: activities, groups, interests and likes
Friends' interests
Friends' likes
Your profile info: activities, groups, interests and likes
Friends' interests
Friends' likes
Comment