[curryst]

The other poster is right, I can't see any way this is an accessibility issue.

You could try pushing back with a First Amendment complaint. Say you have a sincere and deeply held belief that using Facebook is wrong, and that forcing you to use it violates your First Amendment rights. The Supreme Court has held that beliefs do not need to be strictly religious in order to be protected. It's the same route anti-vaxxers take.

I still wouldn't hold my breath. You might win, but your children will already be in college by the time it's all sorted.