This plugin will help you to display Facebook Comments on your website. You can use Facebook Comments box on your posts/pages

Effortlessly show any Facebook timeline activities straightforwardly onto your website on sidebar.

The WP Social Comments lets people comment on content (pages, posts etc) on your site using their Facebook account.

Add Facebook social plugins and the ability to publish new posts to a Facebook Timeline or Facebook Page. Official Facebook plugin.

Wordpress Plugin for embedding facebook posts into wordpress blog

This plugin provides easy and quick use facebook like box widget in your blog. You can fully customize facebook like box in easy way.