Zack Whittaker. Facebook won't let you opt out of its phone number 'look up' setting. TechCrunch, March 2019. URL: https://techcrunch.com/2019/03/03/facebook-phone-number-look-up/ (visited on 2023-12-07).
This source is about how facebook users will have to use their phone number to sign up for the account, and then facebook will publicly post the users phone number for everyone to see. This is something we have seen a lot in this class where users private information will be posted publicly without them knowing.