I'm looking for an existing view controller like ABPeoplePickerNavigationController that instead of showing contacts from an address book shows a user's Facebook friends.
I've created a custom picker before but after seeing Words with Friends do something like the people picker, it seems like a better solution... but I don't know if they created their picker from scratch nor can I find anything out there.
There isn't any open source libraries/frameworks that supply this functionality. You would just have to roll your own, may be a cool idea to open source it as well.
I can see people using such a thing.
UPDATE: After your new find, I do see KNMultiItemSelector does have the Facebook friend picker functionality.