<meta name="description" content="{{ page_description }}"/>
  <meta name="keywords" content="{% if page.keywords %}{{ page.keywords }}{% else %}{{ site.keywords }}{% endif %}">
  <meta name="author" content="{% if page.author.name %}{{ page.author.name }}{% else %}{{ site.author.name }}{% endif %}">

  <meta name="HandheldFriendly" content="True">
  <meta name="MobileOptimized" content="320">

  <!-- Social: Facebook / Open Graph -->
  {% if page.id %}
  <meta property="og:type" content="article">
  <meta property="article:author" content="{% if page.author.name %}{{ page.author.name }}{% else %}{{ site.author.name }}{% endif %}">
  <meta property="article:section" content="{{ page.categories | join: ', ' }}">
  <meta property="article:tag" content="{{ page.keywords }}">
  <meta property="article:published_time" content="{{ page.date }}">
  {% else%}
  <meta property="og:type" content="website">
  {% endif %}
  <meta property="og:url" content="{{ page.enforce_ssl | replace:'index.html','' }}">
  <meta property="og:title" content="{{ page_title }}">
  <meta property="og:image" content="{{ page_image }}">
  <meta property="og:description" content="{{ page_description }}">
  <meta property="og:site_name" content="{% if page.author.name %}{{ page.author.name }}{% else %}{{ site.author.name }}{% endif %}">
  <meta property="og:locale" content="{{ site.og_locale }}">

  <!-- Social: Twitter -->
  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:site" content="@{{ site.author.twitter_username }}">
  <meta name="twitter:title" content="{{ page_title }}">
  <meta name="twitter:description" content="{{ page_description }}">
  <meta name="twitter:image:src" content="{{ page_image }}">

  <!-- Social: Google+ / Schema.org  -->
  <meta itemprop="name" content="{{ page_title }}">
  <meta itemprop="description" content="{{ page_description }}">
  <meta itemprop="image" content="{{ page_image }}">

  <!-- Canonical link tag -->
  <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.enforce_ssl }}">
  <link rel="alternate" type="application/rss+xml" title="RSS" href="{{
  "/feed.xml" | prepend: site.enforce_ssl }}">