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A comment on Facebook Is Giving Advertisers Access To Your Shadow Contact Information. Parent comment

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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