I DON'T ACCEPT INCIDENTAL ADDITIONS.
(If you've met me in real life, write me on the wall.)
If I don't know you and you want to add me as a friend on Steam, write a message on my wall, first explaining what you want, please. Thank you. Yes, and I make exceptions for people I recently played with. However ... you may need to remind me if we played recently. Please write on my wall. I will under no circumstances accept friendship requests from people whose profiles are private unless you do as I said earlier and write to me on the wall first.
I repeat: don't worry about adding me as a friend if your profile is private, if you are not going to write on my wall. Or if I can't write you on the wall to ask you about these things.