The media storm around Alex from Target is just the latest example of teen girls creating a phenomenon.
The company surveyed 7,200 teenagers with an average age of 16 — the same age as Alex from Target.
Many faces can be clearly seen in locations such as the living room and bedrooms.
In many videos tagged as being from Singapore, the homes have layouts typical of a Housing Board flat.
Some are seen using the toilet with the door ajar.
They are installed for security purposes or to remotely monitor children, the elderly, domestic workers and pets.