I want to invite my friend on facebook and i dont know his e-mail address because its his nickname listed on my yahoo messenger list.please help…how can i get to know his email address instead of his nickname.

or something like that (I wish I had taken a screen shot). It is a request from someone I want no contact with. I rejected it, but I wanted to know whether this person specifically invited me or if there is some way that I was on their e-mail list and it just automatically sent the request to every yahoo user in their address book.

I want to add someone on my Mailing list but not let that person know, so that person will not be on my messenger.