anchor.diff:  <% if !user_signed_in? %>
       <button
       id="tagsBTN"
  -    class="disabled btn btn-share btn-addTag"
  +    class="disabled btn btn-share btn-addTag tagsBTN"
       type="button"
       data-toggle="popover"
       data-placement="bottom"
  
positive.code:     </button>
      <script>
    $(function () {
    $('.favBTN').popover({trigger: "hover"});
  
    });
  </script>
  
negative.code:     >
        <i class="icon icon-tag"/>
      </button>
  
      <button
          id="favBTN"
  