Are you being scanned? How facial recognition technology follows you, even as you shop

As digital billboards record customers' reactions to advertisements tailored to them, just who is safeguarding Australians' privacy?

If you shop at Westfield, you've probably been scanned and recorded by dozens of hidden cameras built into the centres' digital advertising billboards.

The semi-camouflaged cameras can determine not only your age and gender but your mood, cueing up tailored advertisements within seconds, thanks to facial detection technology.