Disqus is a networked community platform used by hundreds of thousands of sites all over the web. With Disqus, your website gains a feature-rich comment system complete with social network integration, advanced administration and moderation options, and other extensive community functions.
Configuring Disqus for Drupal is pretty straightforward. Install the disqus module, enable viewing Disqus comments permissions for anonymous users. Visit admin/config/services/disqus and configure the disqus application by setting up a new disqus application at https://disqus.com/api/applications/ and registering a new application.
On successful creation of a new application, one would need to specify the access toke, public and private key provided by the created application at admin/config/services/disqus. The shortname should be the website shortname that you registered Disqus with. If you registered http://example.disqus.com, you would enter "example" here.
However there is a caveat and that's where most of my head scratching happened. The shortname should not be long. Unfortunately, disqus does not provide the maximum length applicable for shortname. For example, jagritiinnovations does not work. Make it short , example jagriti and you will be in peace :)