Let me repeat that: THERE IS NO WAY TO NOT USE FACEBOOK.
Everyone's photos: Mine, yours, Stallmans, get posted to Facebook, annotated with our names (which is increasingly becoming easy enough to do with ML -- the human component will increasingly decline). If at least one of your friends uses Facebook, Facebook has profile information on you.
Stallman doesn't have a Facebook account, but things posted to Facebook identify where Stallman is, who his friends and peers are, who he interacts with, etc.
Signing up for a Facebook/Google Scholar/Researchgate/etc. simply gives you some level of control over the visibility of the information collected about you. If you care about your personal brand, there is strong reason to do it. It's almost blackmail. But if you don't do it, you're still on Facebook; simply without the EULA, and without any control.