I have been using Disqus in order to handle blog comments for a long time. I was also using it when I was with Ghost. It’s a great and good looking way to handle comments. It makes your blog more mobile. It has one downside which is that the comment box is iframe so I don’t think it’s good for SEO.

Disqus’s own help center:

With this light here is my disqus snippet in my jekyll code:

<div id="disqus_thread"></div>

<script type="text/rocketscript">

var disqus_shortname = 'YOUR_USERNAME';

var disqus_identifier = '/jekyll/2015/08/24/jekyll-disqus-same-comment-everywhere/';

var disqus_url = '\{\{ site.url \}\}\{\{ page.url \}\}';

var disqus_title = '\{\{ page.title \}\}';

var disqus_category_id = '\{\{ post.category \}\}';

Trick is assigning a unique identifier to the disqus_identifier javascript variable. In our case page.url is pretty unique. And also we are not supposed to assign same thing to disqus_identifier and disqus_url. So url is the full url with site info, identifier is the relative path.