1 user with multiple email addresses/ multiple social network accounts

Anthony,
There's a few options:
* Disable the Automatic Registration features of JFBConnect. This will bring new users to a Register or Login page. On that page, they can fill out profile information to create a new account *OR* login to an existing account. If they do that, their existing account will be updated to work with the new social network they are logging in with as well.
* In the SCLogin module, enable the "Show Reconnect Buttons" option in the Logout section. That will show the social network icons for any networks the user hasn't already connected to their account. You can see an example by going to the My Account menu in the top right. Any accounts you haven't linked to this site should show.

One, or both, of the above should reduce any confusion your users may be running into.

I hope that helps,
Alex