Raymoy,
Very sorry for the delay, but nice sleuthing on the possible cause.
Please check that in the Facebook Application configuration, you've set both the Site URL and Domain URL as follows:
Site URL:
www.friendsurplus.com/
Domain URL: friendsurplus.com
Hopefully, you just have the www in the domain URL and that's the problem. Another thing to try is removing the www from the Site URL, but that shouldn't be necessary.
I looked through the rest of the code on your page and everything looks good, so not sure what else the cause would be. From a quick look, it does seem like you have some other Facebook widgets installed, but I don't see them. If you do, try disabling any other Facebook plugins or modules and see if that helps. If so, we'll help you figure out how to re-enable them if you need them.
Thank, and good luck,
Alex