A student at my school posted a mean comment about a math teacher on Facebook, saying “Ms. Smith is a f***ing bitch and is really a shitty teacher.” During school, ten other students “liked” the comment. The principal heard about the post and threatened to suspend the student who posted it and give anyone who “liked” it a detention. Can the school punish a student for venting on social media?

Because yearbooks aren't created to make profits, using song lyrics or a book quote in a yearbook ad would probably count as educational fair use, so it wouldn't violate copyright.