Capture Disqus new comments in Google Analytics

ga-disqus.js

// Adds the onNewComment callback to the disqus_config of the embed code
// that sends 'New Comment' events over to Google Analytics.
// The callback can also be used for any other analytics service like Parse.ly, Chartbeat, Mixpanel
var disqus_config = function() {
        this.callbacks.onNewComment = [function(comment) {
              ga('send', {
                'hitType': 'event',            // Required.
                'eventCategory': 'Comments',   // Required.
                'eventAction': 'New Comment',  // Required.
                'eventLabel': 'New Comment'
            });
        }];
  };