As Miley Cyrus will probably tell you, stalking is not a welcomed activity from anyone (her stalker is appearing in court). Stalking a person can be creepy, it’s always an invasion of privacy, and for a young girl like Miley Cyrus, it’s probably more than a little frightening.

These sinister stalking innovations aren’t all for tracking down your favourite celeb. From fashion shoots and pets, to Twitter and iPhones, here are 23 stalking innovations that won’t scare Miley Cyrus.