window.onload = function () {
  var url = window.location.pathname,
      file = url.split('/')[url.split('/').length - 1].substring(0,5);

  if (file == 'entry') {
    add_shares(url);
  }
};

function add_shares (url) {
  var section = document.getElementsByTagName('section')[0],
      div = document.createElement('div');

  div.id = 'social';
  div.style.cssText = 'margin-top:1em;padding-top:1em;border-top:1px dashed gray;'
  div.innerHTML += '<h3 style="margin:0;color:gray;font-style:normal;">Comments</h3>';
  section.appendChild(div);

}