First off... I don't own a kindle, though a good friend does. I was looking at it Thursday and right in the help file on the device it says something to the effect of, If you accidentally delete content off your kindle, you can re download it and all of your bookmarks, notes, and where you left off reading will be downloaded as well. this would imply that they are uploading this from your kindle on a fairly regular basis. Most likely every time you connect your whispernet. I'm not saying that they monitor that data, but you never know. (does the eula say they don't?)
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