[jacques_chester]

> The vast majority of books on Amazon would have zero reviews if they only let you review a book after purchasing it on Amazon.

A little optional badge to indicate that the user purchased the book from Amazon wouldn't go astray.

[joshkaufman]

Amazon recently added this. I just published a book, which is why I noticed.

You can see "Amazon Verified Purchase" on this review, under the name: http://www.amazon.com/review/R3VSS8V2NFX1NB/ref=cm_cr_pr_per...

[jacques_chester]

Great minds, and now me!