So it looks like the plugin is working... sort of... I published a new post today and it's showing some retweets as reactions in the comments (see http://www.cultivatingcapital.com/sustainable-businesses/california-passes-benefit-corporation-and-green-business-legislation). However, I only got email notification of these new comments when I went into the WP dashboard and had the plugin manually look for social comments after I saw them on Twitter. Also, it's not pulling in FB reactions, although the post has been shared and received a few likes (see http://www.facebook.com/greenchamberofcommerce).
also, when logged out i am unale to send a comment as a facebook user. in other words the 'sign in with facebook' button is not working.
sounds to me like there is new API stuff going on at FB and this plugin needs an update.
Thanks Alex and all the other developers who are working on this. FB is a tough nut to crack...