Facebook info.

gistfile1.m

- (IBAction)getFacebookUserInfo:(id)sender {
        NSArray *permissions = [NSArray arrayWithObjects:@"email", @"basic_info", nil];
        [FBSession openActiveSessionWithReadPermissions:permissions allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError *error)
         {
             /* handle success + failure in block */
             if (!error) {
                 [self me];
             } else {
                 NSLog(@"Session ended");
                 [self hideProgressHud];
             }
         }];
}

---

- (void)me {
    if (FBSession.activeSession.isOpen) {
        [[FBRequest requestForMe] startWithCompletionHandler: ^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
            if (!error) {
                NSLog(@"Username : %@", [user objectForKey:@"username"]);
            } else {
                NSLog(@"Error: %@", error.localizedDescription);
                [self hideProgressHud];
            }
        }];
    }
}