I really like the page numbers: Page 74 of 404 is a lot more familiar to me than the locations ever were. And it doesn't really matter to me that the page numbers relate to an actual book, but I do think that's kind of cool and could be useful for students.
I'm not sure that I'll use any of the social media bits, though.
PS - And the page numbers automagically appeared on a book I bought and downloaded last month!
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