I have no idea. In the Javascript console in my browser I see
Failed to load resource: the server responded with a status of 503 (Service Unavailable) http://www.kfc.martjack.com/Handler/Facebook.ashx?Method=TwitterLogin
Visiting the link displays an “Oops!” message.
Not clear how you’ve built the site, I’m afraid. You can read more about implementing sign-in with Twitter here.