Adding action links to posts using JavaScript and the FB.UI Feed dialog.

action_links.html

<div class="well">
  <button class="btn btn-info share-btn">Share</button>
</div>
  
<script type="text/javascript">
function fb_share() {
  FB.ui( {
    method: 'feed',
    name: "Search Google",
    link: "https://www.google.com",
    picture: "https://www.google.co.uk/images/srpr/logo11w.png",
    caption: "The world's most popular search engine",
    actions: {"name":"Search", "link":"http://www.google.com"}
  }, function( response ) {
    // do nothing
  } );

}

$(document).ready(function(){
  $('button.share-btn').on( 'click', fb_share );
});
</script>