Facebook is likely to improve this security issue in future.  And users should be cautious in safeguarding their privacy as documented below: https://www.pcmag.com/news/366918/facebook-doesnt-allow-phone-number-look-up-opt-out Facebook won’t let you opt out of its phone number ‘look up’ setting Facebook is facing fresh outrage over allowing everyone to look up users with a phone number.  The default setting […]