gistfile1.m

Foursquare *foursquare = [[Foursquare alloc] initWithAccessToken:accessToken];
[foursquare getUserwithCallback:^(BOOL success, id result){
    if (success) {
        NSLog(@"%@", (NSDictionary*)result);
    } else {
        NSLog(@"%@", [(NSError *)result localizedDescription]);
    } 
}];