Which company first implemented a large-scale recommendation algorithm for retail, forever changing how online stores suggest products to customers?

The digital transformation of retail has been driven by technological innovations that changed how we shop forever. Among these, personalization algorithms represent one of the most impactful developments, enabling retailers to create tailored shopping experiences. This poll tests your knowledge about the pioneering developments that led to today's sophisticated retail recommendation systems that seem to know what you want before you do.

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Amazon with its item-to-item collaborative filtering (1998)
eBay with its BiddingBuddy system (1997)
Netflix with its Cinematch algorithm (2000)
Yahoo with its ShopSmart technology (1996)