[blasdel]

The "blog post as direct response" model works really well on Tumblr.

Everywhere else it only works at the extreme ends — for total takedowns like the recent Kurzweil/Myers dustup and friendly 'Sue's post on x inspired me to post this on y', but not anything in between. Trackbacks were the worst thing to come out of SixApart, and those guys were chock full of bad ideas. Basically tailor-made for spam.