Can you get in trouble for making a page about your schools silly uniform policy?

all the group was going to be called was (school name) - Start caring about education, not uniform. Because my school sends you out of class if you are wearing white socks, not grey or if you don't have your tie. Its a public school. I just want to check if i can get in trouble for it, I'm not going to be posting my name anywhere but i dont know if they can find out who i am through facebook. Im just worried i might get in trouble for like cyber bullying the principal or something. I wouldnt be saying anything mean about the principal, but if other people did on the wall would i be liable?