I have gone through the settings and have checked:
-use facebook for comments
-override wordpress discussion settings
Unfortunately, the it seems the wordpress discussion settings are overriding the plugin's command. It seems I can only display Facebook comments, if I'm also enabling Wordpress comments on my post.
I am using a theme that has integrated discussion settings controls on each post page - allowing us to select to show, hide, or use default settings for displaying comments on each post. I've also tested each of these settings to see if I could display only Facebook comments, but it did not work.
I am able to hide the default comments using CSS, which achieves the desired effect but I don't want to rely on styling.
Any idea how to resolve this issue?