<ul class=“social-links”>

{% if site.author.github %}
  <li><a href="https://github.com/{{ site.author.github }}"><i class="fa fa-github fa-lg" aria-hidden="true"></i></a></li>
{% endif %}
{% if site.author.500px %}
<li><a href="https://500px.com/{{ site.author.500px }}"><i class="fa fa-500px fa-lg" aria-hidden="true"></i></a></li>
{% endif %}
{% if site.author.twitter %}
<li><a href="https://twitter.com/{{ site.author.twitter }}"><i class="fa fa-twitter fa-lg" aria-hidden="true"></i></a></li>
{% endif %}
{% if site.author.linkedin %}
<li><a href="https://www.linkedin.com/in/{{ site.author.linkedin }}"><i class="fa fa-linkedin fa-lg" aria-hidden="true"></i></a></li>
{% endif %}

</ul>