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IntenseDebate enhances and encourages conversation on your blog or website. Rich comment functionality, deep platform integration, social network integration, persistent identity, and reply-by-email all deepen your reader engagement. We offer full API access and syndicate your comments to a broad array of publishers and search engines. The result is that more of the internet is aware of the comments made on your properties – which drives traffic to you!

Source: blog.intensedebate.com