hottmae:
My pet peeve is to compliment an author and never get any response, not even a ty. This has happened here a few times after I've sent a popup message. I've concluded either the authors didn't receive it or simply couldn't give a hoot and are basically writing for themselves.
Not all the authors featured here are actually users of the site so it's not always possible to assume that if you send a popup that the actual author will receive it. From what I've observed it seems to me that the vast majority of authors who actually frequent the site are only to happy to enter into dialogue with others.