This Facebook Connect plugin for WordPress enables you to add the Facebook Connect functionalities into your website. This feature would allow your visitors to create a new WordPress account if they are not connected, or attach their Facebook account to an active WordPress user if they are already connected.
No more need for your users to remember their username / password. They can just connect securely in a click of a mouse with their Facebook account!
This plugin also provides a way to get your users Facebook email (that has usually been verified). You can export your users data and emails in a CSV format. You can also define an Autopost Email Message that gets sent automatically to all the users who connects for the first time