Feature or problem with plugin?

When a new user registers on a WP blog, the system automatically sends an email to the admin. It also sends an email with the user's new password to him.

When a user registers via the Ultimate Facebook plugin, neither of these emails is sent.

Is this the expected behavior for the plugin? Did you design it this way?

If not, please explain why this would be happening on a brand new WP install that only has the Ultimate Facebook plugin installed.