Glad I’ve graduated. I, for one, used Facebook to communicate with teachers regularly. It was great for clarifying assignments when teachers weren’t at school (and didn’t have access to school email or phone), especially over long weekends and breaks. As co-editor-in-chief of my school newspaper, my adviser and I used Facebook to communicate with my staff regularly. (It’s no secret that students check Facebook more than their own emails.)
It’s a communication site. No different than a teacher having access to a student’s phone, address or email. (Most teachers already use/access these things commonly.)
Missouri, can’t you put all this effort into Joplin relief or something useful? This law is archaic, and I can guarantee legislators didn’t make a significant effort to ask educators and parents about their opinions on the law.