S/N , serial numbers????, FB uses NO such thing,!
I guess you meant , email address and or
Pass words (pass phrase)
your PC can be trained ,(NO browers told by you) to store PASSWORDS, on any site on earth
if enabled, if not , NOT.
Internet explorer (MS) is now banned at most sites and MS has dropped support for IE1 to 11. so forget that. (EDGE IS new)
use Chrome or better, FireFox V100 + up.
in firefox. click settings , click privacy .
Ask to save logins and passwords for websites
https://www.facebook.com/help/search?helpref=search&query=serial%20numbers
it is true some ,on line , accounts limit devices, like netflix
and is a kinda serial number, ID, hidden
FB shows no such thing in the search box.
they abuse your rights.
https://www.npr.org/2019/07/24/741282397/facebook-to-pay-5-billion-to-settle-ftc-privacy-case
and even punishments.
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