alaingg

The plugin replaces your comment form and includes one that also allows to use the facebook credentials.
Special Features:
<ul>
<li>When users comments on your blog they can choose to send notifications to their Facebook Wall.</li>
<li>Notification is automatically sent to the facebook application wall when a comment is submitted.</li>
<li>Simple Facebook Integration.</li>
<li>Using the plugin should increase the traffic and visibility of your blog.</li>
<li>More easy to comment.</li>
</ul>
Visit the <a href="http://web-argument.com/wordpress-comments-switcher/" rel="nofollow ugc">Plugin Page</a> to see the plugin working.

Comments Switcher

Allows users to comment on your blog using the facebook credentials or the default wordpress guest credentials.

Comments Switcher vs Social Share, Social Login and Social Comments Plugin – Super Socializer