  <meta name="twitter:card" content="summary">
  <meta name="twitter:card" content="summary_large_image" />
  <meta name="twitter:title" content="{{ post.title | default:page.title | default:site.title }}" />
  <meta name="twitter:description" content="{{ post.description | default:page.description | default:site.description }}" />
  <meta name="twitter:url" content="{{ site.url }}" />
  {% if post.excerpt_image or page.excerpt_image or site.avatar_url %}<meta name="twitter:image" content="{{ post.excerpt_i