Este es el head meta mínimo para los sitios con Jekyll

head.html

  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width initial-scale=1">

  <title>{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
  <meta name="description" content="{{ site.description }}">

  <meta property="og:title" content="{{ site.title }}" />
  <meta property="og:type" content="website" />
  <meta property="og:url" content="{{ site.baseurl }}" />
  <meta property="og:image" content="{{ site.baseurl }}/img/og-img.png" />
  <meta property="og:description" content="{{ site.description }}" />

    <!-- twitter card -->
  <meta name="twitter:card" content="summary">
  <meta name="twitter:site" content="{{ site.twitter_username }}">
  <meta name="twitter:title" content="{{ site.title }}">
  <meta name="twitter:description" content="{{ site.description }}">
  <meta name="twitter:creator" content="{{ site.twitter_username }}">
  <meta name="twitter:image" content="{{ site.baseurl }}/img/og-img.png">