I have learned that "none of your business" means "You don't need to know it and I don't want to tell you" But when FB tells "Miki, find more friends" I will say "It's none of my business but yours"
it's specifically "none of" that carries that meaning, it's an idiom. if you say "not my business" instead it means what you want
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"not my job" maybe more idiomatic for this purpose
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I see! I will use it in a usual case. I think FB wants me to find friends for their own business chances therefore I said so
End of conversation
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