BlogEngine.net was good for a while, but I never loved the commenting system. I switched to Disqus and I wrote a tool for that as well.
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(Published to the Fediverse as: Commentary #marketing #comments #blogger #disqus #facebook The evolution of comments on ITHCWY. From Blogger, BlogEngine.net, Disqus, Facebook and then finally I give up and write and moderate my own system. )