Facebook requestForMyFriends returns no friends data

Question

I used the FBRequest to request the friend list of user.

FBRequest *requestFriendList = [FBRequest requestForMyFriends];
[requestFriendList startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error){
                 if (!error)
                 {
                     NSArray *fbFriends = [result objectForKey:@"data"];
                     //...
                 }
             }];

However, the returned result of the request didn't contain any data. I printed out results, it contains the friend count, but no data inside.

Printing description of result:
{
    data =     (
    );
   summary =     {
        "total_count" = 585;
    };
}

If the request failed or the app doesn't have permissions, should it return an error or the "total_count" also is not shown?

So is there anything I did wrong? Anyone can help me fix this problem?

Thanks!!

Answer 1

Graph API 2.0 changed the behaviour of the /friends endpoint. It now returns the list of friends who have authorized your Facebook app, as opposed to the complete list of friends. It's also a new permission - user_friends. From the Facebook Platform Changelog:

Friend list is no longer part of the default permission set and has its own permission: Asking for access to a person's friend list is now a separate permission that your app must request. The new permission is called user_friends.

Friend list now only returns friends who also use your app: The list of friends returned via the /me/friends endpoint is now limited to the list of friends that have authorized your app.