The JO Facebook Recommendations Box shows personalized recommendations to your users. Since the content is hosted by Facebook, the module can display personalized recommendations whether or not the user has logged into your site. To generate the recommendations, the module considers all the social interactions with URLs from your site. For a logged in Facebook user, the module will give preference to and highlight objects her friends have interacted with.
You must specify a domain for which to show recommendations. The domain is matched exactly, so a module with site=facebook.com would not include activity from developers.facebook.com or www.facebook.com. You cannot currently aggregate across multiple domains.