Moderators are janitors. You flag us when someone throws up in the hallway. We are not professors, tasked with grading answers to questions. If someone provides an unsatisfactory answer, downvote them, leave a comment, or provide a better answer. Do not flag the answer as "unsatisfactory." There is nothing a moderator can (or should) do about a bad answer. Thanks.
This is what I usually do when I want to make an informal contact with a user for something trivial, as
Contact[ing] a user directly via private message [is reserved] to address serious behavior problems
Normally, the user replies in another comment directed @Will. If no more comments are needed, I delete both. If more are needed, I delete and leave a message requesting the user to ask a question here.
Anyhow, I checked back to see if there was any movement on the question when I saw my comment was deleted. Wondering if I had gotten flagged (and another mod had deleted my comment to save me from further beclowning myself), I checked to see who deleted it.
Joe is a brand new StackOverflow member who is about to celebrate the fifteenth (day) anniversary. A proud member with a stunning reputation of 28, he enjoys Pina Coladas and getting caught in the rain with his buddy Sean. And, surprisingly enough, they not only share the same IP, but also 98% of the votes Joe has cast!
Okay, its obvious Joe is a sock for Sean. Fine. I'll leave the merge and suspension for a later date. But what I really wanna know is...
How the heck did Joe delete my comment?