David Sifry thinks we should all turn off comments and let people who want to comment get their own blog. That just turns comment spam into trackback spam. What we really need are automatic link of a link whitelists via Technorati.

If you link to someone from the main text of your blog, then you are probably willing to allow them to comment or trackback to your blog. While that is easy enough to build on your own, it provides a pretty narrow slice of the world. If you could specify the degree of separation to build a whitelist of places that you link to plus places that they link and so on, then you’d really have something. Of course, Technorati already knows all that.