Pseudo-Joomla user

Facebook User Only is the option you want. It does create a completely standard Joomla user that any other component will see and treat normally.

In the v4.2 release due out next week, we've actually changed the name of that setting to be clearer. The new setting name will be "Registration Flow" and the options will be "Normal Registration" and "Automatic Registration". The Auto reg is the same as Facebook User Only, where the account will be created automatically without any forms.

Hope that helps,
Alex

To see the login credentials again, you have to remove the application from your Facebook account. In Facebook.com, go to Account Settings -> Apps, and then click the 'x' next to your application. That will force the credential check again (even if you don't delete the user from Joomla first).

As for future credentials.. if you add a profile plugin and import info from their profile, it will most likely require a new permissions confirmation when the user tries to login next. There are some profile fields which don't require extra permissions, so it may not be required. However, most fields require some permissions, and in that case, the box will appear on the next login only. Each field has different types of permissions for 'basic' and 'extended' information. You'll have to test with the fields you want to import and the resulting login popup. Some fields can be skipped by the user, but still allow them to login your application/site, so it's not a horrible thing if you add a new popup later (the user can simply decline the new info).

Hope that explains,
Alex