Disqus is a realtime commenting system with a focus on clean design, great UX and building a community with your commenters.
Ranked in these QuestionsQuestion Ranking
Pro Seamless design
Seamless design that doesn't require users to leave the page to access features such as profiles.
Pro Clean, minimalist interface & design
The Disqus design is minimalist and is broken down into three tabs - discussion, community and My Disqus.
The discussion interface provides the usual elements, but with unique features like visual indicators of live actions, such as new replies and even when another user is typing. It's possible to sort discussion by new, old and best.
The community tab is designed to help connect commenters together to form a network that keeps them coming back. It is also a great source of traffic from external sites.
My Disqus helps users quickly keep track of activities in their network as well as manage notifications.
Pro Can be easily integrated in any website via iframes
Can be easily included into any website using the iframe form.
Pro Wide adoption
There's a large pre-existing user community. Many people already know how to use this comment system.
Pro Not connected with the Evil Facebook ecosystem.
Pro Works with static sites
Disqus can be used with a static site so it's possible to keep the benefits of a static blog and still have dynamic comments.
Pro Community features
Community features such as Top Commenters, Top Discussions and the ability to form networks around your own commenters
Con Tracking users
Mining and selling their data.
Con Sponsored comments
Disqus puts ads in their embeds.
Con Does not allow you to customize its style
!important flags in its CSS to prevent you from being able to customize its style at all.