I'm loving this plugin, and in my opinion is much neater and easier to use than other Facebook Comments plugins.
My only worry is that this doesn't seem to work in IE? The elements are loaded (.fbcommentbox etc) but nothing is loaded in to them.
I have embedded the Facebook Comments Social Plugin directly from Facebook (http://developers.facebook.com/docs/reference/plugins/comments) and it works fine across all browsers - however it shows the same comments site-wide, whereas your plugin shows specific post comments which is what I want.
Hope that makes sense and you can point me in the right direction for getting this working!