Users are complaining that the phone number Facebook hassled them to use to secure their account with two-factor authentication has also been associated with their user profile — which anyone can use to “look up” their profile.
Worse, there is no option to opt-out.
But even if users haven’t set up two-factor, there are well documented cases of users having their phone numbers collected by Facebook, whether the user expressly permitted it or not.
When asked specifically if the social media giant will allow users to users to opt-out of the setting, they said it won’t comment on future plans. And, asked why it was set to “everyone” by default, the feature makes it easier to find people you know but aren’t yet friends with.