hugo-sustain/layouts/partials/social.html

<div class="social">
	<h4>
    {{ if .Site.Params.Github }}
	  <a href="http://github.com/{{ .Site.Params.Github }}"><i class="fa fa-github"></i></a>
    {{ end }}

    {{ if .Site.Params.Email }}
	  <a href="mailto:{{ .Site.Params.Email }}"><i class="fa fa-envelope"></i></a>
    {{ end }}

    {{ if .Site.Params.Twitter }}
	  <a href="http://twitter.com/{{ .Site.Params.Twitter }}"><i class="fa fa-twitter"></i></a>
    {{ end }}

    {{ if .Site.Params.LinkedIn }}
	  <a href="http://linkedin.com/in/{{ .Site.Params.LinkedIn }}"><i class="fa fa-linkedin"></i></a>
    {{ end }}

    {{ if .Site.Params.Stackoverflow }}
	  <a href="http://stackoverflow.com/{{ .Site.Params.Stackoverflow }}"><i class="fa fa-stack-overflow"></i></a>
    {{ end }}
	</h4>
</div>