Integrating a Comment System

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We all know that how important it's to have a good comment system integrated to a blog. A good comment system should have the follow features. Apart from just enabling the commentator to login using different social networks, the comment system should allow people to leave comments easily. I've tried few comment systems and currently installed Intense Debate in my blog which I find brings lot of comments and traffic all the way. Intense debate has lot of plugins that makes commenting easier for your users. Disquss another comment system doesn't have any plugins, but allows one to leave comments using any of the social networks one has account. NOw tell me, which is your favorite commenting system you've integrated into your blog?