It has not for my client however.
I’m receiving the same thing on one of my client’s websites. Only, I just installed it today. Everything looks like it is set up correctly on Facebook, and the privacy settings are all set to public. The site that is having difficulty is http://www.cantonbounties.com/kja. The link to my client’s Facebook site works, but there aren’t any posts despite the following message that’s received when I test the configuration, “Your configuration seems to be okay and working! Nice work.”