flex/pelican/themes/Flex/templates/partial/og_article.html

{% if not PLUGINS or 'seo' not in PLUGINS or 'pelican.plugins.seo' not in PLUGINS %}
  {% if OG_LOCALE %}
    {% set default_locale = OG_LOCALE %}
  {% else %}
    {% set default_locale = 'en_US' %}
  {% endif %}
  <meta property="og:site_name" content="{{ SITENAME }}"/>
  <meta property="og:title" content="{{ article.title|striptags|escape }}"/>
  <meta property="og:description" content="{{ article.summary|striptags|escape }}"/>
  <meta property="og:locale" content="{{ article.metadata.get('og_locale', default_locale) }}"/>
  <meta property="og:url" content="{{ SITEURL }}/{{ article.url }}"/>
  <meta property="og:type" content="article"/>
  <meta property="article:published_time" content="{{ article.date }}"/>
  <meta property="article:modified_time" content="{{ article.modified }}"/>
  <meta property="article:author" content="{{ SITEURL }}/{{ article.author.url }}">
  <meta property="article:section" content="{{ article.category.name }}"/>
  {% for tag in article.tags %}
  <meta property="article:tag" content="{{ tag.name|escape }}"/>
  {% endfor %}
  {% if 'cover' in article.metadata %}
  <meta property="og:image" content="{{ SITEURL }}/{{ article.metadata['cover'] }}">
  {% else %}
  <meta property="og:image" content="{{ SITELOGO }}">
  {% endif %}
{% endif %}