While I suppose you might think the OP is a bit paranoid, sometimes companies do this (datamining).
A dating site I've used reads people's emails and then figures out various conclusions based on the things in the email (like certain phrases or subjects that improve your chances of getting a response). If a dating site would do that (apparently just for fun, they post the results on the blog) why wouldn't a company whose main business revolves around books try to figure out what people are reading?
Not to send the FBI after you, but perhaps see what people really read, rather than say they read.
Heck, a lot of people even do this sort of thing voluntarily with things like Last FM.
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