Guys, I've activated the plugin, created the app in facebook developers.
When I try to register, it says...
"App Not Set Up: This app is still in development mode, and you don't have access to it. Switch to a registered test user or ask an app admin for permissions."
However, on facebook itself, when I look at the app, it says...
"Your app is currently live and available to the public."
So I've no idea why it's not working.
Perhaps you can test it at musclehacker.com
I'm going to go ahead and try creating the twitter and google logins now.
I followed the instructions and pasted in the created application credentials (App ID and Secret) into the sys/Ext/hybridauth/config.php file.
Any help would be great.