JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>



<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        
          <iframe allowtransparency='true' frameborder='0' scrolling='no' src='//www.facebook.com/plugins/likebox.php?

href=http://www.facebook.com/theblogwidgets&width=402&height=255&colorscheme=light&show_faces=true&show_border=false&stream=false&header=false'

style='border: none; overflow: hidden; margin-top: -19px; width: 402px; height: 230px;'></iframe>
          
      </div>
     </div>
  </div>
</div>

JavaScript

jQuery.cookie = function (key, value, options) {

// key and at least value given, set cookie...
if (arguments.length > 1 && String(value) !== "[object Object]") {
options = jQuery.extend({}, options);

if (value === null || value === undefined) {
options.expires = -1;
}

if (typeof options.expires === 'number') {
var days = options.expires, t = options.expires = new Date();
t.setDate(t.getDate() + days);
}

value = String(value);

return (document.cookie = [
encodeURIComponent(key), '=',
options.raw ? value : encodeURIComponent(value),
options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
options.path ? '; path=' + options.path : '',
options.domain ? '; domain=' + options.domain : '',
options.secure ? '; secure' : ''
].join(''));
}

// key and possibly options given, get cookie...
options = value || {};
var result, decode = options.raw ? function (s) { return s; } : decodeURIComponent;
return (result = new RegExp('(?:^|; )' + encodeURIComponent(key) + '=([^;]*)').exec(document.cookie)) ? decode(result[1]) : null;
};

jQuery(document).ready(function($){
   if($.cookie('FBpopup') != 'yes'){ 
      setTimeout(function() { $('#myModal').modal('show'); }, 500);
   }
   $.cookie('FBpopup', 'yes', { path: '/', expires: 7 });
});