Facebook won’t let you opt out of its phone number ‘look up’ setting

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. But some users are finding out just now that Facebook’s default setting allows everyone — with or without an account — to look up a user profile based off the same phone number previously added to their account. Although users can hide their phone number on their profile so nobody can see it, it’s still possible to “look up” user profiles in other ways, such as “when someone uploads your contact info to Facebook from their mobile phone,” according to a Facebook help article.

Source: techcrunch.com