Allowing your visitors to comment on your website is a good way to encourage a community for your website to grow and allows visitors to contribute their own thoughts to your content. DisQus (http://disqus.com) is a popular third-party comment management system that can be integrated with any content platform.
1. You will need to install the DisQus Comments extension for Joomla!, which is available from Joomla!'s official extension repository at http://extensions.joomla.org/extensions/contacts-and-feedback/articles-comments/5259: