With Fb Graph v2 it isn't possible anymore to get a list of friends, {user-id}/friends only will only return any friends who have used (via Facebook Login) the app making the request. A found solution would be {user-id}/taggable_friends, but this will not return an uid, so it is not possible to compare this list with {event-id}/attendings.
So to me it seems that with die new Open/Closed Graph Api it's not possible anymore to provide this feature to users of my app.
Is there any solution?