multiple-3rd-party-widgets.js

(function() {
    
    var script,
        scripts = document.getElementsByTagName('script')[0];
        
    function load(url) {
      script = document.createElement('script');
      script.async = true;
      script.src = url;
      scripts.parentNode.insertBefore(script, scripts);
    }
    
    load('//apis.google.com/js/plusone.js');
    load('//platform.twitter.com/widgets.js');
    load('//s.widgetsite.com/widget.js');
    
}());