[star0zero]

I'm also assuming that they had to take a bit of a lowest common denominator approach to m2m communication given that they have cell-based (read - costs amazon money) and wifi (does not cost amazon money) enabled versions of the device. If they tracked every page read and sent a log periodically, that _could_ get expensive quickly on the part of the cell-based versions depending on what network agreement they have (numerex, for example, still charges by the kb for this type of low byte traffic). Given that the rules needed to be the same for both types of devices, you couldn't necessarily have an if(wifi){ //send log} else { //send last page syncd} code branch. This is just a giant guess given that I know nothing of amazon's partner network agreements.