Facebook comments plugin will help you display Facebook Comments on your website. You can use Facebook Comments box on your pages/posts.
Add the Facebook Comments box to your website and sync it with your WordPress database; show comment counts and use latest comments widget.
This plugin will insert a Facebook Comment into your WordPress Database when user comments on your post / page.
This plugin will insert a Facebook Comment Form, Open Graph Tags and ALSO insert all Facebook Comments into your WordPress Database for better SEO.