If you post something publicly you have no expectation of privacy.Most likely, one of the troublemakers admitted it was planned on Facebook as I doubt that the principal attempts to monitor the feeds of every single student at the high school.Now, I'm all for the school not having anything to say about what you do outside of school grounds and events, but yelling meep in class is just stupid and disruptive. I think banning meep is pointless as there are already going to be rules about disrupting class that could be used to punish students, but w/e.