Some Liquid tags for adding in Opengraph data in your meta tags for Octopress

head.html

{% if page.title %}<meta property="og:title" content="{{ page.title }}" /><meta itemprop="name" content="{{ page.title }}" />{% endif %}
{% if page.author %}<meta name="author" content="{{ site.author }}" />
<meta property="article:author" content="https://plus.google.com/+JeremyMorgan" />
<meta property="og:type" content="article" />{% endif %}
{% if page.date %}<meta property="article:published_time" content="{{ page.date }}" />{% endif %}
{% capture category %}{% if page.categories %}{{ page.categories }}{% endif %}{% endcapture %}
{% if page.categories %}<meta property="article:section" content="{{ page.categories }}" />{% endif %}
{% capture description %}{% if page.description %}{{ page.description }}{% else %}{{ content | raw_content }}{% endif %}{% endcapture %}
<meta name="description" content="{{ description | strip_html | condense_spaces | truncate:150 }}" />
<meta property="og:description" content="{{ description | strip_html | condense_spaces | truncate:150 }}" />
<meta itemprop="description" content="{{ description | strip_html | condense_spaces | truncate:150 }}" />
{% if page.keywords %}<meta name="keywords" content="{{ page.keywords }}" />{% for keyword in page.keywords %}<meta property="article:tag" content="{{ keyword | replace: ',', '' }}" />{% endfor %}{% endif %}
{% if page.ogimage %}<meta property="og:image" content="{{ page.ogimage }}" /><meta itemprop="image" content="{{ page.ogimage }}" />{% endif %}<meta property="og:site_name" content="JeremyMorgan.com" />
 <!-- http://t.co/dKP3o1e -->
<meta name="HandheldFriendly" content="True" />
<meta name="MobileOptimized" content="320" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
{% capture canonical %}{{ site.url }}{% if site.permalink contains '.html' %}{{ page.url }}{% else %}{{ page.url | remove:'index.html' }}{% endif %}{% endcapture %}
<meta property="og:url" content="{{ canonical }}" />