If you are going to add someone out of the blue to your contact list in instant messenger, and you have the good luck that they don’t reject you out of hand, don’t then ignore a request of
"Hi, can you please tell me who you are?"
or reply to that request with
And leave them waiting.
I don’t know about anyone else, but I hate IM spam and If I think you are at all susspect I will block you, with prejudice.
And then I will send my pet.