You cannot willingly transfer information to a second party and agree to terms that make you partially forfeit copyright so they can enable others to see or mod

You cannot willingly transfer information to a second party and agree to terms that make you partially forfeit copyright so they can enable others to see or modify the information you gave them? Then what the hell is every Facebook post ever that the company mines for personal information? Thats in their TOS, and you agree to it by posting to their service.