Facebook Members by arpitshah is a WordPres Social Plugin that enables Facebook Page owners to attract and gain Likes from their own website. It uses Facebook Like Box.
Features
Uses Official Facebook APIs.
Facebook Like Box Plugin Integration.
Show Like Box on any Page or Post.
Show Like Box in Sidebar/Widget Area.
Option to specify Width, Height, Number of Connections, Stream, Heading for both Sidebar and Post/Page widget.
Download and info: http://wordpress.org/extend/plugins/facebook-members/