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"phone numbers given to [Facebook] to enable two-factor authentication were being targeted in advertisements"
https://www.thedailybeast.com/facebook-confirms-giving-advertisers-access-to-user-phone-numbers
"phone numbers given to [Facebook] to enable two-factor authentication were being targeted in advertisements"
https://www.thedailybeast.com/facebook-confirms-giving-advertisers-access-to-user-phone-numbers