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Re:Show HN: Amazon Search on Steroids by ronp2016 on Wednesday August 17, 2016 @03:26PM (#12307596)
I think he means the quotes praising the book that appear typically on the back cover of a physical book. https://susanleighnoble.wordpress.com/2012/09/18/writing-an-...
Re:Show HN: Amazon Search on Steroids by giarc on Wednesday August 17, 2016 @03:49PM (#12307800)
I think they may refer to the actual Amazon page, found under "Editorial Reviews". For example, from a random book I found.

https://www.amazon.com/gp/product/0385542364/ref=s9_qpp_gw_d...

Editorial reviews by Oprah, someone from the NYT, People, NPR etc.