[PRESALE]

That's not possible. You can automatically popup a login form that will request the user to login, but you can't automatically register them and import any information from their Facebook profile until they have 'approved' your application. That's a Facebook requirement that is meant to prevent abuse and ensure that user's really want to share their information with you and your site.

I hope that helps explain, but if you have any other questions, just let me know.

Thanks,
Alex