when someone just randomly sends me an instant message and expects me to know who they are, especially if they have never met me or talked to me before. When I ask who they are and how they got my sn they get all annoyed like i'm supposed to be this all knowing being, I may be "the wise one" but I'm not THAT good :wink: Anyway, I just think it's inconsiderate not to identify yourself to a stranger, even if it's only online.