custom
FB.ui(
  {
   method: 'feed',
   name: 'The Facebook SDK for Javascript',
   caption: 'Bringing Facebook to the desktop and mobile web',
   description: (
      'A small JavaScript library that allows you to harness ' +
      'the power of Facebook, bringing the user\'s identity, ' +
      'social graph and distribution power to your site.'
   ),
   link: 'https://developers.facebook.com/docs/reference/javascript/',
   picture: 'http://www.fbrell.com/public/f8.jpg'
  },
  function(response) {
    if (response && response.post_id) {
      alert('Post was published.');
    } else {
      alert('Post was not published.');
    }
  }
);