If you print out FB’s T&C’s, plus all of the layers of embedded links within links, it’s 87,000+ words. That is designed to be unreadable and incomprehensible, it’s an attempt to baffle. Even stupid people, illiterate people, and just plain lazy people don’t deserve to be taken advantage of.
If you want to talk about what people “should” know, there’s s reasonable man statute, and it definitely doesn’t include what you’re describing.