When I visit your page and click on the Login button for the SCLogin module, the modal window pops up. In that window I see the Facebook button. When I press the button to create an account with FB, I received an email to activate the account. Once activated, I could then log in to the front-end using my credentials properly.
* If the problem is that you want the user to be logged in right away, then you will need to set our 'Skip Joomla User Activation' setting to Yes. Otherwise, the log in will not work until the account is activated.
* If you are having a different issue, please describe in detail the behavior you're seeing vs what you're expecting, the specific URL you're on, etc.
-Melissa