Which company first implemented collaborative filtering for product recommendations in 1998, a technology that would revolutionize e-commerce personalization?

Before AI and machine learning became ubiquitous in e-commerce, early recommendation systems helped shape how we shop today. These pioneering technologies fundamentally changed retail strategy and customer experience, creating the personalization we now take for granted. Test your knowledge about the historical development of retail recommendation systems that laid the groundwork for today's sophisticated shopping experiences.

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Amazon with its 'Customers Who Bought This Also Bought' feature
Netflix with its movie suggestion algorithm
eBay with its related listings system
Firefly, later acquired by Microsoft, with its music and website recommendation platform