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Re:Look Up Unknown Phone Numbers Using Facebook Reset Password by codingdave on Monday January 04, 2021 @10:40AM (#25632705)
There was also opt-out, even decades ago. You could tell the phone company that you wanted an unlisted number, and you would be excluded from the phone book.
Re:Look Up Unknown Phone Numbers Using Facebook Reset Password by thesuitonym on Monday January 04, 2021 @11:44AM (#25633814)
You can do that with Facebook, too. In fact, Facebook does not know and has never known my phone number.

Or rather, I'm sure it does know because my friends have me in their contact lists and shared that with Facebook, but it's not tied to my account in any UI way. I didn't have to opt out because I never even opted in.