Create Facebook comments box as well as adding the comments to the sites own database.
http://wordpress.org/plugins/seo-facebook-comments/
Widgets · WordPress Plugins
Get access to data on 21,427 websites that are SEO Facebook Comment Customers. We know of 1,590 live websites using SEO Facebook Comment and an additional 19,837 sites that used SEO Facebook Comment historically and 964 websites in the United States.
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Get a list of 21,427 websites using SEO Facebook Comment which includes location information, hosting data, contact details, 1,590 currently live websites and an additional 347 domains that redirect to sites in this list. 19,837 sites that used this technology previously and 964 websites in the United States currently using SEO Facebook Comment.