端末の設定画面(Twitter)へ飛ばしたい ref: http://qiita.com/neiraza/items/9cf827dc7585bbc366c2

OpenSettingForTwitter.m

- (void)viewDidLoad
{
    SLComposeViewController *tweetSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
    tweetSheet.view.hidden = YES;
    [self presentViewController:tweetSheet animated:NO completion:^{
        [self dismissViewControllerAnimated:NO completion:nil];
    }];
}