* When you login with Facebook.. are you actually logged into your site? Do registered menus appear and such?
YES
* Is a user created in the Joomla User Manager area?
IT'S an already existent user
* Is a user created in the JFBConnect -> Usermap area?
NO
Even if I can't see the user in the Usermap area, it's present in the channel owner list (screenshot), but it's not allowed to do something it seems.
Login page ->
canoe-club-geneve.ch/membre