How did @getfb_bot work?

[Cyc199_77]

Пожалуйста, обратите внимание, что пользователь заблокирован
getfb_bot is not working ,does anyone know how it worked,getting fb id using phone number

 

[fullzhouse]

I'm not sure but usually these things work by retrieve access using phone number or by finding friends by phone number (share contact list)

 

[eleph4nt]

probably it also leveraged the facebook data leaked some months ago, where FB ID and phone numbers are available (even if numbers date back to 2019)