Site map capabilities? Invite Facebook friends from site

Whenever a user connects from a social network, JFBConnect records their social network ID and their Joomla ID as a row in the database. That is required so on future logins with that user, JFBConnect knows which Joomla user is authenticating.

The "User Map" table is what stores that mapping from social network ID to Joomla ID. In the admin area, you can view which Joomla users on your site have connected to each of the social networks you offer.

As for invitations, we no longer support sending requests like that through JFBConnect. Facebook has added and removed the ability to send invitations many times over the last decade and we've implemented most of them (Facebook Invites, Game Request, Open Graph Actions, etc). Currently, there aren't any methods that Facebook exposes for sending invites or notices about your website to specific users. It's been used for too much spam in the past so they simply don't allow it anymore.

I hope that helps explain, but if you need anything else, just let us know!

Thanks,
Alex