Based on WPBook ( http://wordpress.org/extend/plugins/wbook/ ), WPBook Lite enables cross-posting of blog items to Facebook, and import of comments
WPBook enables cross-posting of blog posts from WordPress into Facebook.
Comments made against notifications posted to the wall (via WPBook Lite) or timeline will be imported as comments inside WordPress.
If your blog is available via HTTPS, you may wish to consider the full WPBook instead - both are free.
This plugin requires PHP 5.