Hmmm, I found a curious example of the OP on Smashwords. 26 x 5 star reviews. Each looked different enough to start with, but when l looked through the users behind each review I found that most of them have only reviewed this one book (suspicious enough over 26 users), but several of them had reviewed one other book - all the same other book - also with 5 star reviews.
Another thing that surprised me was the discovery that Smashwords allows a user to add multiple reviews to the same book. Some of these users had reviewed the alternative book 3 times.
(I was hunting through trying to work out where my next short story might fit best in the genres, and I wondered what the hell the "Mashups" genre was supposed to be, which is where I found the above example. I'm still not sure what "Mashups" means.)
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