Big retailer is watching you, matching online tracking

Tesco, the world's third biggest retailer, drew criticism from British privacy groups earlier this month with plans to scan the faces of queuing customers to determine their gender and rough age to better target adverts.

BERLIN: The next time you walk into a shop, consider this: You may not be using your phone, but it is giving out a unique signal that the retailer may be monitoring.

A face scanner may check your age and gender while sensors pick up your body heat to help locate popular parts of the store.