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Although tracking ads follow people as they browse different websites, Drawbridge uses statistics to do the same across devices.
It gathers information on which gadgets are being used and what is being done with them to build up "anonymous" profiles of different users.
The statistics generate a probability for which profiled user might be on that smartphone, tablet or laptop.
So far, said Drawbridge, it has drawn up profiles connecting 200 million users to the different electronic gadgets and applications they use during the day and in separate locations.
Drawbridge's technology is based around cookies...Tracking Users Across Devices For Ad Delivery [bbc.co.uk]