Past few months Facebook was testing a new registration social plugin and just recently they have officially announced this feature. For detail, you can access the documentation directly here .
After play a while with its API documentation, I think the concept it is definitely interesting. However one piece thing that I think this plugin still missing would be a field type to support Password field.
Anyway to make all this short, for Joomla website owner, you can now integrate this new Facebook social plugin feature to your Joomla website with Facebook User Registration Form , a commercial Joomla component from our partner website, TwitHut .
Joomla Facebook User Registration Form is a Joomla 1.5 Component that allows users to easily sign up during user registration for your website with their Facebook account.
When logged into Facebook, users see a form that is pre-filled with their Facebook information where appropriate.
Joomla Facebook User Registration Component gives you the flexibility to ask for additional information which is not available through the Facebook API (e.g. favorite movie).
This component also allows users who do not have a Facebook account (Non Facebook users) or do not wish to sign up for your site using Facebook to use the same form as those who are connecting with Facebook.
This eliminates the need to provide two separate login experiences.