Which e-commerce platform was the first to implement a sophisticated mathematical recommendation algorithm that fundamentally changed online retail?

The intersection of mathematics and e-commerce has transformed how we shop online. Advanced algorithms, predictive analytics, and mathematical models now power personalized shopping experiences. Behind these innovations are pioneers who first implemented mathematical concepts into online retail. Test your knowledge about which platform first revolutionized e-commerce with sophisticated recommendation algorithms based on collaborative filtering and mathematical modeling.

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Amazon with its item-to-item collaborative filtering algorithm (1998)
eBay with its BiddingBuddy prediction system (2001)
Netflix with its CineMatch recommendation engine (2000)
Alibaba with its TaoBrain customer behavior modeling (2003)