Is it possible?
this plugin is highly undocumented. the documentation is overly simplified thinks that everyone here is an expert and expect to read between the lines.
Can create user, but creates user every time. how? find_or_create_user_by(facebook_uid)
this is hacky but it does the job: http://gist.github.com/600328
I have a fork of this plugin that works with the new Graph API, the only thing it is lacking right now is connecting to an existing user, if anyone has some ideas on how this could be done and require the user to authenticate to the account they are connecting to let me know.
My fork now supports the new JS API and can connect to existing users, take a look here: https://github.com/studybyte/authlogic_facebook_connect