There is a "Description" MOBI metadata item, which is limited to 4000 characters. Also a "Review" (2000 characters).
The Description is used by Windows MobiPocket Reader in its eBook view. I checked (using an ebook with a description), and the description metadata is not a menu item on the Kindle 1 with the latest firmware.
Most MOBIs don't provide a description, so it isn't surprizing that the K2 is going to "call home" for the information.
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