Release blog post with carefully written examples. Commenters find several ways the examples could be improved. Learn. Rinse. Repeat.
miniblog.
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As blog comments become increasingly less fashionable, I've often seen people write "email me instead".
Perhaps there's a compromise between these? A website could have a comment box that emailed the author. This minimises friction for commenters, but avoids spam on the site.
Why do so many blogging platforms require commenters to provide an email address? I don't think I've ever received an email as a result of a comment I've made.