website/_includes/plugins/fb_pagelike.html

<div class="fb-page pluginBlock" data-href="https://www.facebook.com/{{ include.button_href }}" data-hide-cover="false" data-show-facepile="false" data-show-posts="false">
  <div class="fb-xfbml-parse-ignore"><blockquote cite="https://www.facebook.com/{{ include.button_href }}"><a href="https://www.facebook.com/{{ include.button_href }}">{{ include.button_text }}</a></blockquote></div>
</div>
<script>
  window.fbAsyncInit = function() {
  FB.init({
    appId      : '{{ site.fbappid }}',
    xfbml      : true,
    version    : 'v2.3'
  });
  };

  (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/sdk.js";
   fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));
</script>