I have installed this plugin on a few websites with little to no issues, though on this one it doesn't seem to show the comments box.
There is a option in the theme to enable comments on the posts i tried this thinking it would replace the wordpress comment box with facebooks. no luck wordpress comments showed up.
I did test posting a comment on a published post on facebook and it did import the comment it just didn't display on the website blog post. though the meta showed one comment.
I am hoping this is not to hard to fix maybe the template file needs to be modified on the theme?
Any one have any ideas?