Disqus, pronounced discuss, is a service for blog comments. Disqus enables bloggers to make the conversations on their blogs more interactive and manageable. Our distributed comment system connects readers across blog communities, while empowering publishers in promoting their content. In short, using Disqus is a better way for people to participate in conversations initially started by blog posts.

Discussions on your blog are now made more interactive and social. Readers can rate comments to help make sure only good comments stay in the conversation. Rated comments contribute to a commenter’s clout, or reputation, on blogs across the web. Disqus is currently a free service to use. If you do not use any of these, Disqus also provides a general code snippet for any website as well.

Disqus is a hosted service. This means that the discussion threads are completely powered by their software and servers. However, they do not make any claims to the ownership or control of the comments. You do still own your comments.

Pricing: Free
Requirements: -
Source: http://disqus.com