Render blocking javascript in facebook ultimate

Hello,
When I checked my website with google speed test, it listed a couple of render blocking javascripts that I should remove.

One of them is
http://hornaffairs.com/en/wp-content/plugins/wpmu-dev-facebook/js/wdfb_facebook_login.js?version=2.8.2

Is there anything I can do to comply with recommendation or simply ignore it?