Electronic Frontiers Foundation releases its report on popular e-book platforms and their privacy policies. They comb through the fine print of Google Books, Amazon Kindle, Barnes & Noble Nook, Kobo, Sony, Overdrive, Indiebound, Internet Archive, and Adobe Content Server so you don’t have to, though you really should.
We know by now that almost all e-book platforms track book searches and purchases, but nevertheless, it is still disconcerting to see that material gathered in one place. Google, Amazon, Barnes & Noble, Kobo and Sony all collect this information, and a great deal more.