I read this thread frequently but at the same time, wonder why such threads exist on forums.
First, it seems like a nice way to provide compliments though I'm not sure how someone knows they apply to them.
Second, it seems to be a bit like a release valve, that lets the pressure escape when it gets too high. It allows to people to confront others indirectly or let off some steam. That feels a little bit passive aggressive to me though. Again, how do you know it's you?
It's a little like a covert channel except the recipient doesn't know to look for the message.
It's a bit confusing actually.