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Use threading to wait for another class's method to execute, or is there a simpler way?
[facebook requestWithMethodName:@"fql.query" andParams:dictionary andHttpMethod:@"GET" andDelegate:self];

- (void)requestLoading:(FBRequest *)request {
    NSLog(@"Loading...");
}

- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"Response received");
}

- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
    NSLog(@"Request failed");
}

- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data {
    NSLog(@"Request did load raw response");
}

- (IBAction)friendsButtonPressed:(id)sender {
    int selectionTag = [sender tag];

    //Get access to the instance of the wrapper in the app delegate (since it needs to remain refereced after app exits to log in and returns
    MiniBfAppDelegate *appDelegate = (MiniBfAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.facebookWrapper loadListDataFor:selectionTag];

    //Initialise the friends view controller
    FriendsViewController *friendsViewController = [[FriendsViewController alloc] init];

    //NEED TO WAIT UNTIL LISTDATA IS RETURNED?

    //Give the friends view controller the list data
    friendsViewController.listData = appDelegate.facebookWrapper.friendsList;

    //Push the friends view controller
    friendsViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:friendsViewController animated:YES];
    [friendsViewController release];
}

[[NSNotificationCenter defaultCenter] postNotificationName:@"myNotificationName"
                                                        object:self
                                                      userInfo:[NSDictionary dictionaryWithObject:XXXX forKey:@"someObject"]];

[[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(yourMethodHere:)
                                                 name: @"myNotificationName"
                                               object: nil];

- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"Response received");

    //Give the friends view controller the list data
    friendsViewController.listData = appDelegate.facebookWrapper.friendsList;

    //Push the friends view controller
    friendsViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.navigationController pushViewController:friendsViewController animated:YES];
    [friendsViewController release];
}