Difference between kayfuns?

So ib been googling trying to figure out the difference between the kayfun 3.1, and the kayfun 3.1es
And can only find info on the es

<img src="http://ecigfortmyers.com/wp-content/plugins/wp-o-matic/cache/1d00b6d8eb_sig-153231.jpg” border=”0″ alt=”” />


Fatal error: Uncaught Exception: 12: REST API is deprecated for versions v2.1 and higher (12) thrown in /home/ecigfort/public_html/wp-content/plugins/seo-facebook-comments/facebook/base_facebook.php on line 1273