Open graph tags used in my Octopress blog.

head.html

<!-- Rich Object stuff -->
  <meta property="og:url" value="{{ site.url }}{{ page.url }}">
	<meta property="og:type" content="website" />
	{% if page.title %}<meta property="og:title" value="{% if page.title %}{{ page.title }}{% endif %}">
	<meta property="og:description" value="{% if page.description %}{{ page.description }}{% else %}{{site.description}}{% endif %}">
	{% else %}<meta property="og:title" value="{{ site.title }}">
	<meta property="og:description" value="{{ description }}">
	{% endif %}{% if page.cover %}<meta property="og:image" value="{{ site.url }}{{ page.cover }}">{% endif %}

if using default theme, some of those blocks in the gist can be used simply like this (copied from elsewhere in the same file). Add this to the bottom of head.html:

<meta property="og:title" value="{% if page.title %}{{ page.title }} - {% endif %}{{ site.title }}" />
<meta property="og:description" value="{{ description | strip_html | condense_spaces | truncate:150 }}" />
<meta property="og:url" value="{{ site.url }}{{ page.url }}" />                    
<meta property="og:type" content="website" />                                    
{% if page.cover %}<meta property="og:image" value="{{ site.url }}{{ page.cover }}" />{% endif %}