Facebook Is Giving Advertisers Access To Your Shadow Contact Information

Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by jandrese on Thursday September 27, 2018 @12:17PM (#18085895)

Note however that to enable any other type of 2FA you first have to give them your phone number. You can delete your phone number afterward, but it's too late, they have seen everything.

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Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by Mankrik on Thursday September 27, 2018 @12:20PM (#18085943)

Well it won't matter once you change your number, but nobody should have to consciously think about doing that because the company you gave it to is using it for non-user account security purposes.

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Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by css on Thursday September 27, 2018 @12:19PM (#18085927)

Interesting, thanks for letting me know. I don't have an account. I understand _why_ they require you to verify a phone number though, for the exact reason this article explains.

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Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by jandrese on Thursday September 27, 2018 @12:32PM (#18086097)

The phone number isn't for your protection (it's actually really terrible for 2FA), it's for Facebook's protection. It's an anti-bot mechanism to require a unique phone number for each account, or no more than 5 accounts per number or so.

They also refuse VoIP numbers for authentication.

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