For example, if you have your own blog, you can say anything you want (in moderation of course, remember you can’t yell fire in a crowded theater) but if you had an article in the school’s paper, your principal or “editor” would have to approve it before it was published. The case example would be Hazelwood v. Kuhlmeier. The Supreme Court ruled in favor of the Hazelwood School district because it was the school’s paper and the principal is allowed to censor whatever he deems inappropriate for the paper.