Add disqus to a ghost theme with easy to use disqus settings in default.hbs

default.hbs

<!-- include this just before the </head> tag -->
<script type='text/javascript'>//<![CDATA[
    var disqus = {
        'activate' : true,
        'shortname' : 'example'
    };
//]]></script>

post.hbs

<!-- include this where you want to display the comments -->
<div id="disqus_thread" class="comments"></div>
<script type="text/javascript">//<![CDATA[
    if ( disqus.activate ) {
        var disqus_shortname = disqus.shortname;
        var disqus_identifier = '{{id}}'; // use {{post.id}} outside the {{#post}} loop

        /* * * DON'T EDIT BELOW THIS LINE * * */
        (function () {
            var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
            dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
            (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
        }());
    }
//]]></script>