Via NPR: So, it turns out your ebook says a lot about you.
"Most e-readers, like Amazon's Kindle, have an antenna that lets users instantly download new books. But the technology also makes it possible for the device to transmit information back to the manufacturer.
"They know how fast you read because you have to click to turn the page," says Cindy Cohn, legal director at the nonprofit Electronic Frontier Foundation. "It knows if you skip to the end to read how it turns out."
Cohn says this kind of page-view tracking may seem innocuous, but if the company keeps the data long-term, the information could be subpoenaed to check someone's alibi, or as evidence in a lawsuit.
And it's not just what pages you read; it may also monitor where you read them. Kindles, iPads and other e-readers have geo-location abilities; using GPS or data from Wi-Fi and cell phone towers, it wouldn't be difficult for the devices to track their own locations in the physical world."