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Some people post reviews of all books they have read over the past several decades, so not all of them would have to be in the past few years.
This is part of the double edged sword...
Smashwords requires you to purchase it from them to post a review, this is strict but also limits the random reviews possible.
Amazon lets anyone post reviews but this leaves the system open to abuse like this.
I like Newegg to an extent, you can post a review, and it checks your account to see if you have purchased it before, and shows "purchased from Newegg: (yes or no)".. so the "No" reviews tend to carry less weight than those that were purchased from the site.
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