Catalina has been receiving threat messages from steve, one of her facebook contacts. steve has never met catalina, but he has been tracking her activities on the social network regularly. this is an example of: cyberterrorism. spear phishing. cyberstalking. voip spamming.

This is an example of cyberstalking.
Steve is stalking Catalina on the internet - he knows what she is doing, what she is liking, what she is into, everything about her based on her online profile and activities. He isn't stalking her in real life, but rather only online, which is why it is called 'cyber.' She can delete him from his friends, or set her profile to private, and he won't have access to her information.