Facebook's privacy practices have drawn renewed scrutiny after revelations that the platform links user phone numbers to profiles, enabling searches and targeted advertising. This issue emerged as users adopted two-factor authentication (2FA) to secure accounts, only to find their numbers exposed.
The 2019 controversy highlighted how Facebook connects phone numbers with user accounts, making them searchable even after privacy settings are adjusted. Researchers warned that uploading contact lists to the platform could still allow profile lookups, though Facebook implemented restrictions to curb abuse.
"Facebook lacks even a shred of ethics" ~ Walt Mossberg
Users can adjust privacy settings to limit phone number visibility, but the default setting remains public. Facebook maintains that 2FA simplifies friend discovery, though critics argue the practice prioritizes ad revenue over user security.
Security experts, including Alex Stamos, have criticized Facebook's approach, stating that 2FA should be separated from search and advertising systems. In a 2019 interview, Mark Zuckerberg acknowledged the complexity of data collection, noting that Facebook aims to improve privacy controls without relying on subscription models.
For enhanced security, users are advised to replace SMS-based 2FA with authenticator apps. Facebook allows this transition through its privacy settings, though the process requires navigating multiple menu options.
Despite these measures, concerns persist about how platforms like Facebook leverage personal data. The 2016 Wired article on SMS-based 2FA underscored the risks of relying on phone numbers for account verification, a practice now under increased scrutiny.
