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Oh good. Facebook gives advertisers your two factor authentication phone number.

<< They found that when a user gives Facebook a phone number for two-factor authentication or in order to receive alerts about new log-ins to a user’s account, that phone number became targetable by an advertiser within a couple of weeks. >>

https://www.gizmodo.com.au/2018/09/facebook-is-giving-advertisers-access-to-your-shadow-contact-information/