head.html

{% assign cover_image = page.path | prepend: '/' | prepend: site.source %}
{% capture cover_image_exists %}{% cover_exists {{ cover_image }} %}{% endcapture %}

{% if page.image and cover_image_exists == "true" %}
    <meta property="og:image" content="{{ site.url }}{{ page.url }}{{ page.image }}" />
{% else %}
    <meta property="og:image" content="{{ site.url }}/images/social/headshot.jpg" />
{% endif %}