Im trying to understand, are you violating a friend's privacy now if you tell a random third party that you are friends with them?
Example, you are chatting at a party with someone and they ask you if you know Bob since he works at your company. You say yes and you say you are good friends with him. You violated Bob's privacy here?
There is a difference between someone mentioning, with intention (that they happen to know X and implying they could offer to make that introduction), and an automated system just bulk sharing a whole address book.
If the question were framed more like:
"Do you consent to sharing your entire address book, so that we can better market to you and your friends and offer targeted ads based on that data to our real customers?"
Example, you are chatting at a party with someone and they ask you if you know Bob since he works at your company. You say yes and you say you are good friends with him. You violated Bob's privacy here?