No, I'm fully blocking and moderating comments. They are for serious students who need help, not drive-by netizens. In the past I had them open, but after the first two hits by HN or reddit I had to lock it down so that students wouldn't get thrashed.
FWIW i signed up to your udemy course, but I don't particularly feel like making a disqus account to also comment on the book, that's what's bothering me. I guess I will just abstain from commenting though, it's fair enough.
