diff --git a/_config.yml b/_config.yml
index 0808bc8..b8ffcb0 100644
--- a/_config.yml
+++ b/_config.yml
@@ -9,6 +9,7 @@ baseurl: "" # the subpath of your site, e.g. /blog/
 url: "http://yourdomain.com" # the base hostname & protocol for your site
 twitter_username: jekyllrb
 github_username:  jekyll
+facebook_app_id:
 
 # Layout settings
 header_type: default  # values [ drawer, default ]
diff --git a/index.html b/index.html
index 3f06de9..4249157 100644
--- a/index.html
+++ b/index.html
@@ -26,7 +26,7 @@ layout: default
         <i class="material-icons">more_vert</i>
       </button>
       <ul class="mdl-menu mdl-js-menu mdl-menu--bottom-right" for="btn-high-{{ post.id }}">
-        <li><a href="https://www.facebook.com/dialog/share?app_id={app_id}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
+        <li><a href="https://www.facebook.com/dialog/share?app_id={{site.facebook_app_id}}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
         <li><a href="https://twitter.com/share?url={{ post.url | prepend: site.baseurl }}&text={{ post.title }}&via={{ site.twitter_username }}" class="mdl-menu__item">Twitter</a></li>
         <li><a href="https://plus.google.com/share?url={{ post.url | prepend: site.baseurl }}" class="mdl-menu__item">Google+</a></li>
       </ul>
@@ -51,7 +51,7 @@ layout: default
           <i class="material-icons">share</i>
         </button>
         <ul class="mdl-menu mdl-js-menu mdl-menu--bottom-right" for="post-{{ post.id }}">
-          <li><a href="https://www.facebook.com/dialog/share?app_id={app_id}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
+          <li><a href="https://www.facebook.com/dialog/share?app_id={{site.facebook_app_id}}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
           <li><a href="https://twitter.com/share?url={{ post.url | prepend: site.baseurl }}&text={{ post.title }}&via={{ site.twitter_username }}" class="mdl-menu__item">Twitter</a></li>
           <li><a href="https://plus.google.com/share?url={{ post.url | prepend: site.baseurl }}" class="mdl-menu__item">Google+</a></li>
         </ul>
@@ -82,7 +82,7 @@ layout: default
           <i class="material-icons">share</i>
         </button>
         <ul class="mdl-menu mdl-js-menu mdl-menu--bottom-right" for="post-{{ post.id }}">
-          <li><a href="https://www.facebook.com/dialog/share?app_id={app_id}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
+          <li><a href="https://www.facebook.com/dialog/share?app_id={{site.facebook_app_id}}&display=page&href={{ post.url | prepend: site.baseurl }}&redirect_uri={{ site.baseurl }}" class="mdl-menu__item">Facebook</a></li>
           <li><a href="https://twitter.com/share?url={{ post.url | prepend: site.baseurl }}&text={{ post.title }}&via={{ site.twitter_username }}" class="mdl-menu__item">Twitter</a></li>
           <li><a href="https://plus.google.com/share?url={{ post.url | prepend: site.baseurl }}" class="mdl-menu__item">Google+</a></li>
         </ul>