public async Task<ActionResult> BeginAsync()
        {
            //var auth = new MvcSignInAuthorizer
            var auth = new LinqToTwitter.MvcAuthorizer
            {
                CredentialStore = new LinqToTwitter.SessionStateCredentialStore
                {
                    ConsumerKey = ServerSettings.TWITTER_CONSUMER_KEY,
                    ConsumerSecret = ServerSettings.TWITTER_CONSUMER_SECRET
                }
            };

            string twitterCallbackUrl = Request.Url.ToString().Replace("Begin", "Complete");
            return await auth.BeginAuthorizationAsync(new Uri(twitterCallbackUrl));
        }