.themes/classic/source/_includes/facebook_like.html
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 <div id="fb-root"></div>
 <script>(function(d, s, id) {
   var js, fjs = d.getElementsByTagName(s)[0];
   if (d.getElementById(id)) {return;}
   js = d.createElement(s); js.id = id;
   js.src = "//connect.facebook.net/en_US/all.js#appId=212934732101925&xfbml=1";
   fjs.parentNode.insertBefore(js, fjs);
 }(document, 'script', 'facebook-jssdk'));</script>