The development of ambient and pervasive devices and systems is gathering momentumrecent examples include the Whereabouts Clock  and digital jewelry . These types of technologies provide new contexts for communication between users. The eSense project  is developing a systems approach for large-scale deployment of ambient technologies, based on the concept of motestiny "disposable" wireless devicesfor a range of application areas, including personal use (e.g., mood-based services), the wireless hospital concept, and the tracking of food processing. General concerns about the risks that large-scale deployment of these technologies will present to the users have also been raised .…
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