Disqus.com is a no cost platform to build up a community by allowing people to comment your content site articles.
Via the Memberzone Dashboard (Setup Tab) you can enable the Disqus comment feature by providing your Disqus shortname.
Each article will then be followed by the Disqus comment GUI component. You have to register with Disqus to benefit from this feature.
As you can see on the screenshot above, the article is followed by the „Start Discussion“ screen of Disqus, which would manage the discussion sessions.