Hello Alex,
No, the user doesn't appear in the Usermap table. I deleted the user, turned on automatic registration, tried registering again but all it did was reload the /community page (no message concerning completing registration, etc), the user once again was correctly created, I activated the user but logging in using the FB button just reloads the /community page and I remain logged out. This time however the user was added to the Usermap.
Thanks,
wdd