I don't post here very often, so maybe I've missed it, but back in the day, you could include some html in comments. You could also, I think, edit your comment after posting to fix errors. I just added a comment to this article:
http://www.thereminworld.com/Article/14323/bbc-podcasts--witness-the-theremin
but could not successfully do either. I tried a second time using square brackets, since that's how it used to work, but no luck. I see the styling toolbar below this post I'm writing right now, but it wasn't below the comment(s) I posted to the story above.