No problem for the support. It's what we do. Thanks for your subscription which allows us too.
I think you're correct in what you're saying. Basically, with JFBConnect, we'll automatically create the Joomla and JomSocial user when someone registers through Facebook. If you install the JomSocial profile plugin, then you can import the user's Facebook profile and avatar into JomSocial as well. For users that don't have a Facebook account (or don't want to use it), they can still register a 'normal' Joomla user.. and that can be done via the normal registration flows of either Joomla (com_user) or JomSocial.
Finally, after you've used JFBConnect a bit, please consider leaving a rating and review on the Joomla Extension Directory for it, or our support. It's certainly not required, but very appreciated!
extensions.joomla.org/extensions/social-...ook-integration/7215
Hope that helps, but if you have any other questions, just let us know!
Alex