Twig markup for Open Graph and other SEO tags

seo_tags.twig

{# Open Graph #}
<meta property="og:title" content="{{ page.title }}" />
<meta property="og:type" content="{{ isArticle ? 'article' : 'website' }}" />
<meta property="og:url" content="{{ page.url }}" />
<meta property="og:image" content="{{ page.image }}" />
<meta property="og:description" content="{{ page.description }}" />

{% if isArticle is true %}
  <meta property="article:published_time" content="{{ page.publishedAt }}" />
  <meta property="article:modified_time" content="{{ page.modifiedAt }}" />
  <meta property="article:author" content="{{ page.author }}" />
  <meta property="article:section" content="{{ page.category }}" />

  {% for tag in page.tags %}
    <meta property="article:tag" content="{{ tag }}" />
  {% endfor %}
{% endif %}