Slight tangent; why do you think that annoys you so much? What is it about these actions that's so intrinsically irritating?
Well it's because I advocate anonymity, those people are trying to change the internet into something it's not. They're trying to introduce their own class system (even if they don't know it) by giving everyone such a detailed identity that eventually the information people put onto the net will become second to who they are.
Information is just that - information, it should have nothing else attached to it or at the least, very little else. Once people begin to care (even subconsciously) about who the information belongs to/was submitted by, in a way that information ceases to be free.