enable-twitter-async.js

$(document).ready(function() {

  // enable on mouseover
  $('.twitter-share-button-placeholder').bind('mouseover', function() {
    enableShareButton($(this));
  });

  // auto enable for mobile
  if (Modernizr.touch) {
    enableShareButton($('.twitter-share-button-placeholder'));
  }

});



function enableShareButton(elm) {

  elm.addClass('twitter-share-button')
    .removeClass('twitter-share-button-placeholder')
    .attr('href', 'https://twitter.com/share')
    .unbind('click');

  !function(d,s,id){
    var js,
    fjs=d.getElementsByTagName(s)[0],
    p=/^http:/.test(d.location)?'http':'https';

    if(!d.getElementById(id)){
      js=d.createElement(s);
      js.id=id;
      js.src=p+'://platform.twitter.com/widgets.js';
      fjs.parentNode.insertBefore(js,fjs);
    }
  }(document, 'script', 'twitter-wjs');

}