A facebook employee explained me how tracking works. Its not the email address Meta is concerned about. Its the IP, device identifiers and location. Meta doesnt care about the email at all apart from sending you emails for notification. Even with a fake email they exactly know who you are. Let’s say you visit CNN.com which has facebook tracker. Facebook has the IP and the device identifiers. Now you login with fake email account on Instagram, facebook knows that’s the IP ans the same device hence it “must” be the same person That’s how facebook creates shadow profiles.
For what it’s worth protecting against fingerprinting is pretty hard, so don’t feel bad if it tells you your browser has a unique fingerprint. For most people (if you’re using Firefox) going to the settings and turning on strict tracking protection and “Do Not Track” set to always send is good enough and will probably stop most attempts by blocking domains that will try fingerprinting. And use Ublock Origin, people.
I use Firefox and Ublock, I’ll do the do not track now!
Yep. I have a blanket “block all Facebook” rule. A lot harder to gather info if your browser refuses to load data and scripts coming from their domains.