Scott Allan Morrison writes:
…. now, new cross-device technologies are enabling the advertising industry to combine all our information streams into a single comprehensive profile by linking each of us to our desktop, mobile phone, and iPad. Throw in wearable devices like a Fitbit, connected TVs, and the Internet of Things, and the concept of cross-device tracking expands to potentially include anything that gives off a signal.
There are two methods to track people across devices. The more precise technique is deterministic tracking, which links devices to a single user when that person logs into the same site from a desktop computer, phone, and tablet.
Read more on Daily Beast.
Thanks to Joe Cadillic for this link.