I've come across a couple of these subblogs where MP authors appear to be talking amongst each other or with just a couple of commenters. Is this a new feature?

And also, did Denton send out a memo instructing writers to "invite" the subjects of posts to comment? Does he think the only thing stopping CEOs, tech mavens and Police PR departments from commenting is that they don't know they can? The "I invited X to comment" is as bad as the "my sister-in-law makes $6,000 a week working from home spam"