I was just rereading some blogs that we have been following and found several comments that were replies to ones I sent, but we never received the replies and so failed to respond. Why was this? In an aha moment I noticed that the "reply" was posted as a new comment, instead of a "reply to this comment" comment. No wonder we never saw them.  So, take this post as a reminder to be sure to click on "reply to this comment" if you want the sender of the original message to see what you wrote.