Nextend Facebook Connect

The plugin guides the webmaster through the process of adding a Facebook authentication button to his login and registration page.

It also allows existing users to link their profiles with a Facebook account.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

The plugin is also available with support for other social networks, including:
Google
Twitter

Features:

• Very well documented
• General settings page added in the WP backend
• Easy to style
• Button creator app

What is new in this release:

• Security fix for redirects.

What is new in version 1.4.56:

• Now the plugin use wp transient for the admin messages.

What is new in version 1.4.36:

• PHP notice fixes.

What is new in version 1.4.35:

• JavaScript login fix for "SimpleModal Login".

What is new in version 1.4.29:

• "There was an error with the FB auth!" fix.

What is new in version 1.4.28:

• Certificate fix.

What is new in version 1.4.25:

• wp_login do_action fix.

What is new in version 1.4.21:

• Bug fix for WordPress 3.5RC1.

What is new in version 1.4.13:

• Some login fixes.

Requirements:

• WordPress 3 or higher