{%- if session_data.title -%}
  {%- assign title = session_data.title | append: " • " | append: site.title -%}
{%- elsif site.title -%}
  <meta property="og:type" content="website" />
  <meta property="og:image:width" content="150" />
  <meta property="og:image:height" content="150" />
{%- endif -%}
  <title>{{ title | default: site.title }}</title>
  <meta property="og:title" content="{{ title | default: site.title }}" />
  <meta name="author" content="{{ writer | default: site.title }}" />