J,
Please make sure you've followed every step of our Facebook Application Setup guide:
www.sourcecoast.com/jfbconnect/docs/soci...ok-application-setup
There are different settings required for each social network, which is why we have the guides to take you through the required steps.
Beyond that, SSL is not required on your site for Facebook authentication. Additionally, Facebook has made some substantials changes this year, which updated releases of JFBConnect have addressed. The latest version is 6.2.3, which has some fixes for changes Facebook implemented in early October which could be part of your problem. I'm not sure what version of JFBConnect you're running, but you can see the full changelog of the different versions to compare what you're using against the latest:
www.sourcecoast.com/jfbconnect/docs/general/changelog