Other relevant studies explore the detection and legal implications of these marketplaces:
: Sellers often recruit reviewers to purchase a product at full price; once a positive review is posted, the seller refunds the cost via third-party payment platforms like PayPal, sometimes adding a small commission.
: This 2024 paper (via arXiv) uses network science to identify "clusters" of reviewers who participate in these paid marketplaces, noting that fake review buyers rely on a relatively small, highly-connected pool of reviewers compared to organic products.
Amazon Vine is an invitation-only program which selects the most insightful reviewers in the Amazon store to serve as Vine Voices. Amazon.com How to Get Reviews on Amazon in 2024 – 7 Proven Methods
The most comprehensive paper on this topic is by researchers from the University of Arizona, UCLA, and USC. It provides an in-depth analysis of the underground marketplaces where Amazon reviews are traded.
: The study identifies that fake reviews are frequently purchased in large, private social media groups, particularly on Facebook.
: The researchers found that while buying reviews provides a short-term boost in sales and ratings, the practice is largely used by low-quality products and ultimately harms consumer trust. Additional Academic Perspectives