I am going to weigh in on whether it is okay for a detective involved in a case to post on a forum for that case.
As long as they don't post anything directly related to the case, I don't see the problem. While it is true that they are not supposed to talk about an active case, this applies to friends and family, as well as posting with strangers.
Should they not be able to go home and talk to their family and/or friends because they are working on a case as long as they don't talk about the case?
Well, I guess if that is the case, then all LE should now be required to not be married or have friends.
Officers know what they can and can not talk about during an active case. YM did not fall off the turnip truck yesterday. He knew the rules and he did not break them.
Someone just got their panties in a wad because they know their case was in the crapper before it ever got off the ground. IMO of course.