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Blog commenting add-on IntenseDebate is snatched up by Automattic, the makers of WordPress.
Disqus has gone 2.0, with a slew of new features including automatic SEO, comment backup, and the option to turn good blog comments into their own blog post.
Third-party comment systems can be helpful and a big step up from the ones that come in stock blog services. We've compiled six we think are worth looking at.