Basically, the student posted a picture of her teacher with a caption that read "... the worst teacher I've ever met..." So since the girl did it from a home computer, and it posed no immediate threat or suggestion of hate or violence, the principal felt it was his obligation to suspend her from school. Maybe a better idea, would be for the principal to use some of that energy to focus on why students are completely unhappy with some of their teachers. Because as we all know, Florida has had its share of bad teachers.
