The 5-star reviews on these 5 Amazon products are probably fake

Some brands are making names for themselves on Amazon AMZN, +1.19% by spamming their products with fake five-star reviews.

That’s according to an investigation of hundreds of tech products in 14 popular categories conducted by the U.K. consumer advocacy group Which?, which reported on Tuesday that the world’s biggest online retailer is “plagued with thousands of ‘fake’ five-star reviews.”

It found that “unknown brands” with names like ITSHINY, Vogek and Aitalk had thousands of unverified reviews playing up their products, meaning there is no evidence that the reviewers bought or used the products that they’re raving about.

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