School Board revising blogs

I’m not sure if this is good or bad. According to this article a district school board in Illinios is going to be monitoring students’ blogs. Not only that, they will be making students who want to participate in extracurricular activities sign a pledge saying that they agree to disciplinary action if the school board finds “illegal or inappropriate” behavior posted on the internet. The question that I have is, “What is inappropriate behavior?” What do you think?