I think I could have had a lot of fun with this circa 77-81. Questioning nonmilitary service on the part of those who should have served. Pointing out uncomfortable facts. Asking why a recently graduated seniors car was always overnight at the science teachers house.
That's the kind of thing you could get away with legally because it all appears to be truthful. The kids in this case, according to the article, made two HUGE legal mistakes: they structured the web page to look like the assistant principal herself posted it and they included a directly false allegation that she was a lesbian. If high school kids are going to post derogatory material about their teachers and school administrators without running afoul of the law, they have to keep it to provable facts and opinions.