add fb comment (#350)

* add fb comment

* Update README.md for facebook comments

* Update _config.yml

* Update README.md

README.md

@@ -104,9 +104,13 @@ Many personalization settings in `_config.yml`, such as setting your name and si
 
 ### Allowing users to leave comments
 
-If you want to enable comments on your site, Beautiful Jekyll supports the [Disqus](https://disqus.com/) comments plugin.  To use it, simply sign up to Disqus and add your Disqus shortname to the `disqus` parameter in the `_config.yml`.
+If you want to enable comments on your site, Beautiful Jekyll supports either the [Disqus](https://disqus.com/) comments plugin or [Facebook](https://developers.facebook.com/docs/plugins/comments) comments.
 
-If the `disqus` parameter is set in the configuration file, then all blog posts will have comments turned on by default. To turn off comments on a particular blog post, add `comments: false` to the YAML front matter. If you want to add comments on the bottom of a non-blog page, add `comments: true` to the YAML front matter.
+To use Disqus, simply sign up to [Disqus](https://disqus.com/) and add your Disqus shortname to the `disqus` parameter in the `_config.yml` file.
+
+To use Facebook comments, create a Facebook app using [Facebook developers](https://developers.facebook.com/docs/apps/register), and add the Facebook App ID to the `fb_comment_id` parameter in `_config.yml`.
+
+If either `disqus` or `fb_comment_id` parameters are set in the configuration file, then all blog posts will have comments turned on by default. To turn off comments on a particular blog post, add `comments: false` to the YAML front matter. If you want to add comments on the bottom of a non-blog page, add `comments: true` to the YAML front matter.
 
 ### Adding Google Analytics to track page views
 

_config.yml

@@ -118,10 +118,16 @@ url-pretty: "MyWebsite.com"  # eg. "deanattali.com/beautiful-jekyll"
 #  uri: "demo.wiki.pro"
 #  opt-out: true
 
-# --- Misc --- #
+# --- Comments --- #
+
 # Fill in your Disqus shortname (NOT the userid) if you want to support Disqus comments
 # disqus: ""
 
+# To use Facebook Comments, fill in a Facebook App ID
+# fb_comment_id: ""
+
+# --- Misc --- #
+
 # Facebook App ID
 # fb_app_id: ""
 

_includes/fb-comment.html

@@ -0,0 +1,14 @@
+{%- if site.fb_comment_id -%}
+<div class="comments">
+    <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 = 'https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.12&appId={{ site.fb_comment_id }}&autoLogAppEvents=1';
+       fjs.parentNode.insertBefore(js, fjs);
+    }(document, 'script', 'facebook-jssdk'));</script>
+    <div class="fb-comments" data-href="{{ site.url }}{{ page.url }}" data-width="100%" data-numposts="5"></div>
+    <noscript>Please enable JavaScript to view the comments powered by Facebook.</noscript>
+</div>
+{%- endif -%}

_layouts/page.html

@@ -12,6 +12,7 @@ layout: base
         <div class="disqus-comments">
 	        {% include disqus.html %}
         </div>
+	        {% include fb-comment.html %}
 	    {% endif %}
     </div>
   </div>

_layouts/post.html

@@ -69,6 +69,7 @@ layout: base
         <div class="disqus-comments">
           {% include disqus.html %}
         </div>
+          {% include fb-comment.html %}
       {% endif %}
     </div>
   </div>