I wonder if, I'm next after making https://nomorefacebook.xyz but that's why it's good to export contacts and other data now and not when it's too late. And don't use it as login provider.
PS I made https://www.quitfacebook.org, so it seems we've got something in common :)
No, not sarcasm, no, not joking. I had decades old email addresses of friends I pinged when the lockdown started, and the vast majority of them got to the intended person.
EDIT: yes, one by one. If they matter to you, they should worth the time.