From The Guardian:
Fake review factories that run on Facebook and manufacture misleading five-star reviews that are then posted on Amazon have been uncovered by investigators from Which?
The consumer group said two large Facebook groups – Amazon Deals Group and Amazon UK Reviewers – were behind the unscrupulous practice, along with smaller groups. Together they may have up to 87,000 members potentially engaged in writing fake reviews.
Inside the Facebook groups, companies post details of products for which they are seeking positive reviews. The reviewers have to pay for the items – so that Amazon believes the buyer is genuine – but after leaving a glowing review, the company refunds the purchase price through PayPal, and sometimes pays an additional fee.
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See Also: Report from Which? Cited in Article