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.
I clicked through to "nomoregoogle" and holy cow I'm amazed by https://www.deepl.com/translator. Switched my bookmarks and linux search actions immediately. Thank you.
Ask for their email, then pen and paper. Or keyboard and a local, maybe synchronized contacts list.
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.
What's sad / frustrating / predictable is that they had an open API until early 2016 to export contacts. No mistake they shut that down to lock folks to the platform I'm sure...
PS I made https://www.quitfacebook.org, so it seems we've got something in common :)