| While the user might have issues (like cookies and other features) - I can guarantee you Facebook does all kinds of creepy stuff to identify who you are. Worse yet, once they think they've successfully identified you - they share your details with who they think you are.
Personal example: Recently I wanted to have a look at a few ex coworker profiles (who are not my friends on FB). I didn't want to use my personal account because then it suggests me to them (something I wanted to avoid, as I'd not been in touch with them for almost a decade). 1. I created a VM (Ubuntu 18.04 + Firefox + uBlock -> enabled everything in uBlock). 2. Tried to create an Fb account -> asks for phone number. I didn't want to be identified so I could not continue. 3. Tried another way to create a new account -> success. 4. Fb obviously tried to figure out who I am -> was unable to do so at that point -> Forced me to post a picture of myself (and suspended my account until I did and they verified it). 5. Posted a made up picture and got past the first hurdle 6. Fb asked me for a phone number -> Logged out and used another means to log in. 7. Fb locked my account and asked for another picture (did similar in Step 5 once again) 8. Looked up my ex co-workers. 9. Until now, I've not been identified, I looked up a friend's profile (this friend is also my personal friend on Fb). FB immediately identified me and showed up my entire friends list as suggested friends). 10. I immediately tried to delete that profile (took 30+ days and they asked for Govt ID). I've had multiple fake FB accounts, and FB's fingerprinting and data sharing is insanely crazy - I recently logged out of one my fake accounts on iOS via Safari Incognito (no FB app, Safari is always used as incognito) - it showed my personal phone number in the log in field. |