Which online retailer first implemented an item-to-item collaborative filtering recommendation system at scale in the late 1990s, fundamentally changing online shopping?

In today's data-driven retail environment, recommendation systems drive significant revenue for online retailers. These sophisticated algorithms analyze customer behavior to suggest products, enhancing shopping experiences and boosting sales. But do you know when and how these systems first emerged in mainstream retail? Test your knowledge about the pioneering technology that transformed how we shop online and set the foundation for the personalized experiences we now take for granted.

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Amazon.com with their 'Customers who bought this also bought' feature
eBay with their 'Similar items you might like' algorithm
Netflix with their movie recommendation engine
Alibaba with their 'Smart Product Suggestion' system