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Few weeks ago I wanted to buy a MSQL performance book. It was weird that the book had perfect reviews and those reviewers they all had same nationality. Weekday a coincidence, lol ...
Well, I checked each, and all of them. They reviewed the same author and on all instances, 5 stars.
It was clear to me that the author paid for those or somehow, he asked relatives or friends to write the fake reviews.
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