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Disqus
Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Benefits

Disqus is a worldwide blog comment hosting service for web sites and online communities that use a networked platform. The company's platform includes various features, such as social integration, social networking, user profiles, spam and moderation tools, analytics, email notifications, and mobile commenting.

Installing Disqus is easy. Simply click on the install now and select your destinatin project. Once installed, you will need to configure it with your Disqus credentials and license key.