I am on the fourth iteration of a comment system for this site.
Then I used a comment system built on top of Wordpress. This was slightly better, but written in PHP.
The new comment system is email-based. Plain email. I drew inspiration from tdarb and lowtechmagazine (who have precisely the same comment "system").
I know that requiring an email adds a small amount of friction in the comment process. I don't know how this will affect comment spam,3 3which was wildly common in previous iterations. but I think it might balance out.
Currently, I enable a significant amount of markup in comments. The comments are processed with markdown and allow mathjax (assuming that mathjax is enabled on the page). This is because I use the same preprocessing on comments as I do on pages for this site.
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