I just tried to authenticate on your site, and received the following error:
Given URL is not whitelisted in Client OAuth Settings: This redirect failed because the redirect URI is not whitelisted in the app’s Client OAuth Settings. Make sure Client and Web OAuth Login are on and add all your app domains as Valid OAuth Redirect URIs.
Please double-check that you've followed our full
Facebook Setup Guide
. For that error, specifically double check step 15.
I hope that helps, but if not, let us know.
Thanks,
Alex