A person who engages in a course of conduct (a series of acts over a period of time) directed at a specific person, which causes substantial emotional distress to that person and serves no legitimate purpose, commits the act of stalking. This can include cyberstalking - threats delivered by electronic communication. If you are a victim of stalking, you can ask the Court for a protective order prohibiting stalking.
Stalking, as used in F.S. 784.048: A person who willfully, maliciously, and repeatedly follows, harasses, or cyberstalks another person commits the offense of stalking.