friend of friend of facebook

Just like the title reads: how do I target friends of people that I have the emails. Only those people, no more no less. (Not the exact people that I have the emails, they are out). I do apologize if this has been asked but google returns smart-ass answers and I am sure I have read somewhere on how to target the friends of the people you have the email to, like close friends or family or something like that. I apologize for the nuub question but BUT I just had a bright idea, that I want to…

friend of friend of facebook