load-twitter.js

<script type="text/javascript">
(function() {
  
  'use strict';

  /**
   * hook method to be executed as soon as shortpoint
   * is available in the page
   */
  function initHook() {

    // exit on edit mode
    if( window.shortPointInserter ) {
        return;
    }

    setTimeout(function() {
      // shortpoint is ready and rendered on the page
      var jsElm = document.createElement("script");
      // set the type attribute
      jsElm.type = "application/javascript";
      // make the script element load file
      jsElm.src = "//platform.twitter.com/widgets.js";
      // finally insert the element to the body element in order to load the script
      document.body.appendChild(jsElm);
    }, 500);
  };

  // shortpoint not yet available in the page
  // wait for shortpoint ready dom event
  document.addEventListener( 'shortpoint-render-above-fold', initHook );

})();
</script>