Which company pioneered the use of collaborative filtering algorithms for product recommendations that fundamentally changed online retail personalization?

In today's hyper-competitive retail landscape, personalization algorithms have transformed how businesses connect with consumers. These sophisticated systems analyze shopping patterns, browsing behavior, and purchase history to deliver tailored recommendations. But which company was truly revolutionary in implementing this technology at scale? Test your knowledge of retail personalization history and how it changed e-commerce forever.

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Amazon with its item-to-item collaborative filtering system (1998)
eBay with its Feedback Profile Recommender (2001)
Netflix with its Cinematch algorithm (2000)
Walmart with its Customer Value Algorithm (1999)