Is it creepy that Amazon is tracking most-highlighted Kindle passages?

Is it creepy that Amazon is tracking most-highlighted Kindle passages? – CSMonitor.com:

In a blog for the Christian Science Monitor Rebekah Denn asks, “Do you think Amazon is invading privacy by tracking which passages readers most often highlight on their Kindles?” What she says about the most-quoted books may surprise you, but don’t forget that the sample size here is quite small.

Even more interesting, I thought, is the question she asks about these notes in the margin: “Am I in the minority here, or do people highlight differently on an electronic reader than they do using neon markers on paper?”