How to detect the Facebook comments plugin, and display a warning if it is blocked by a browser extension.

FacebookCommentsPluginBlockingDetection.js

var updateFacebookCmnts = function(){
	//Give the FB Object a second to update the UI before we work our magic
	setTimeout(function(){
		//The fb_iframe_widget class is added to the .fb-comments element when the iframe loads
		//if it is not there, we can safely assume the comments haven't loaded and can dispaly a warning.
		if(!$('.fb-comments').hasClass('fb_iframe_widget') ){
			//Custom warning message/html
        		var $insertedWarning = '<div id="comments-missing-warning" class="alert alert-danger"><i class="fa fa-exclamation-triangle"></i> Uh oh! Looks like you have the wonderful Disconnect.me, or other social media blocking, plugin installed. This is preventing you from commenting because I use Facebook comments. Whitelist this site to comment.</div>';

			//Insert the aforementioned string before the .fb-comments element
			$('.fb-comments').before($insertedWarning);
		} else if($('#comments-missing-warning').length > 0) {
			//If the FB comments are loaded but the warning message element is still present, remove it.
			$('#comments-missing-warning').remove();
		}
	}, 1000)
}

//Init the function
updateFacebookCmnts();

Article this gist belongs to here: http://jeremybuff.com/notebook/detect-facebook-comment-plugin-blocking/