This is a very ten years ago argument, with facebook being you on the internet.
At any rate, facebook specifically, along with google, taught us that you should never be yourself on the internet, or at least only be some piece of you. Anything else is amateur shit.
What does look interesting is FUTO ID, a way to allegedly verify your identity securely. Might be a nice keypass for other fully or quasi anonymous things online. We’ll need to imagine something good going forward, not copy something bad.
This makes facebook officially the enemy of the Fediverse and the open internet.
Defederate from them completely everywhere they show up. They can’t be trusted.