<footer class=“site_footer”>

{% if site.author %}
  <span class="author">By: {{ site.author | escape }}</span>
{% endif %}

{% if site.twitter_username %}
  <a href="http://twitter.com/{{site.twitter_username}}">Twitter</a>
{% endif %}

{% if site.linkedin_username %}
  <a href="http://linkedin.com/in/{{site.linkedin_username}}">Linkedin</a>
{% endif %}

{% if site.github_username %}
  <a href="http://github.com/{{ site.github_username }}">Github</a>
{% endif %}

</footer>