"Two-factor authentication is an important security feature, and previous year we added the option to set it up for your account without registering a phone number". However, there is no way to get rid of the look-up option entirely as the option is set to default.
It is certainly concerning that a phone number handed over in the name of security could be used for other things, but Facebook says that the settings highlighted "are nothing new", telling TechCrunch that "the setting applies to any phone numbers you added to your profile and isn't specific to any feature".
Facebook is using phone numbers that users submitted for two-factor authentication as a way for them to be searchable on the platform. Facebook can still find your phone number without you even providing it (yep). How?
Facebook Privacy for phone numbers
This includes users who only added their phone numbers to set up two-factor authentication, and believed it would only be used for security purposes. He tweeted highlighting Facebook's privacy setting that doesn't have any feature to completely hide the phone numbers.
Facebook past year amended its solicitation to submit a phone number with a link explaining that the number would be used for other purposes. "Now it can be searched and there's no way to disable that". However, the recent discovery has only intensified concerns stemming from the way Facebook handles user data. The company uses that unique ID, since it's tied to you, and can use it to sell ads, much as it does with everything else it knows about you. Once again, Facebook was using a phone number, which users provided for security, for their own financial gain. Facebook recently warned popular health apps that use its API to be sure they have legal justification for sharing personal data with Facebook, seemingly indicating that the data major health apps are sharing with it, is data it hasn't asked for.
According to Facebook's help content, the user's contact information can be customized according to the user's preferences. Thus you can do multi-factor authentication with Facebook: remove the phone-based 2FA and reactivate it using an authenticator app.
At the beginning of the year, The New York Timesreported that Facebook planning to further integrate the services. FB can't credibly require 2FA for high-risk accounts without segmenting that from search & ads.
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