Jens, I think it’s fine to reply to someone’s blog post with a post in your own blog, rather than a comment:
- If your readers don’t read the other blog, then your readers won’t know about the post.
- Replying to a contentious post on someone else’s blog, by posting it to your own blog is like counting to ten and taking a deep breath.
- The best response to “I hate your blog,” is to remind someone that it’s easy to have one of their own.

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I was wondering what criteria you use for whether or not you close trackbacks on a blog post?
In practice I turn off trackbacks because of the spam problem with them.