Tracking is a big deal in the Cloud.  And it will become bigger and bigger in the future as our digital identity and digital footprints and signatures are followed, counted, tabulated, and inventoried.  Why NOT combine the practical need to keep track of “stuff” by embedding miniature tracking devices in anyone.  We already do it to our pets.  Implants anybody?

RFID Helps Disney Employees Get Into Character – RFID Journal