I installed this plugin today (the lite version) and my test post appeared on my Facebook page immediately. Perfect!
I also added some test comments on Facebook and they haven't been imported back to my blog yet. Does that run on a schedule? How often does it go? I have ticked the box for "import comments" and also "automatically approve". But I'm not seeing the comments and there's nothing about imports in the debug file either. Is there something else I need to do or a way I can test what's wrong?