In the sclogin modul we dont see any facebook login possibilitys.
we have check it with the joomla standard template and our gantry template.
we have disabled all other social Network plugins etc.
The result you can see into the attached file
we are using joomla 3.15
The free SCLogin module doesn't have any social networking integration built-in. It's simply an improved login module over the standard Joomla login module with features like modal popups, better styles, and user menus to display when the user is logged in.
The social networking login features are enabled automatically when you're using our other extensions like JFBConnect for Facebook (and soon Google+ and Twitter) integration or JLinked for LinkedIn integration.
I hope that helps explain, but if you have any other questions, just let us know.