{% block extra_head %}

      <meta property="twitter:card" content="summary">

      <meta property="og:type" content="website">

      <meta property="og:title" content="{% block head_title %}{% endblock %} | {{ SITE_NAME }}">

      <meta property="twitter:title" content="{{ SITE_NAME }}">

      <meta property="og:site_name" content="{{ SITE_NAME }}">

      <meta property="og:url" content="{{ request.build_absolute_uri }}">

      <meta property="og:description" content="CopyleftConf will provide a friendly and safe place for discussion of all aspects of copyleft, including as a key strategy for defending software freedom in Brussels on February 3.">

      <meta property="twitter:description" content="CopyleftConf will provide a friendly and safe place for discussion of all aspects of copyleft, including as a key strategy for defending software freedom in Brussels on February 3.">

      <meta name="description" content="CopyleftConf will provide a friendly and safe place for discussion of all aspects of copyleft, including as a key strategy for defending software freedom in Brussels on February 3.">

    {% endblock %}

{% endblock %}