Module : Facebook Connect Module for Drupal

Purpose
This module enables users on your site to use their Facebook account and participate as registered users. This is intended for Drupal 6.x sites only. The best way to know more is to install this and try it out.

How this works
When a user comes to your site, they will see a Facebook Connect button in the login block (Figure 1. below). Clicking this button will prompt the Facebook Connect dialog (Figure 2. below) which will ask for permissions to connect. If they choose to go ahead, they will be prompted for an email address which will be used to create an account on your site which is in turn linked to their Facebook accounts. They can always login using their Facebook account there after.

Now on logging in, they will see a new Facebook Connect block which will show them a list of their friends also on your site and enable them to invite other friends. You can see an example in Figure 3. below.

Fig 1 : Face book login buttion

Fig 2 : Face book connect login dialog

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Courtesy:- vishalsood.com