In World of Warcraft, you could view the friends of your RealID friends and send them a friend request.
Where is that option in Diablo 3?
Diablo – How to view “friends of friends” for the RealID friends
diablo-3
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Best Answer
Alas, at the moment that feature is not in Diablo 3.
You could go log in to World of Warcraft and do it instead.