I hadn't thought of that aspect. Being public makes it worse. Personally, I've always appreciated feedback on a website - but in a discussion, I agree it's a di

I hadn't thought of that aspect. Being public makes it worse. Personally, I've always appreciated feedback on a website - but in a discussion, I agree it's a diversion that undermines the message (and is annoying). Commenting on blogs are sort of in between those two (really, a discussion if the blogger also comments, as they often do). Some kind of threaded comments might help. e.g. on reddit, you can compress the joke-thread and the pun-thread, to get to the on-topic commentary. A "typo thread"? Or an explicit "typo" tag (which you could hide from the public, and so disable captcha, if you wanted). But I haven't seen threaded comments on blogs - maybe they aren't needed? It seems an obvious idea to try.