Your eBook is reading you: "It's no secret that Amazon and other digital book retailers track and store consumer information detailing what books are purchased and read. Kindle users sign an agreement granting the company permission to store information from the device—including the last page you've read, plus your bookmarks, highlights, notes and annotations—in its data servers. Amazon can identify which passages of digital books are popular with readers, and shares some of this data publicly on its website through features such as its "most highlighted passages" list." - Adriano