Fackson111 I need it for university...
Just out of interest can you provide details of how they're locking you in?
Orphee You need a fake/temporary mail address and a real phone number to validate your facebook account.
This and if you absolutely need to use it, try using their PWA (open Facebook.com in browser then open the browser menu and select Install App from there or Add to Home Screen) and if absolutely necessary to use their app use their Lite one if possible, if not the full fat experience but use it isolated in a secondary user profile.
Orphee Nothing related to GrapheneOS.
True enough but correctly labelled Off-Topic.