Which company pioneered the first widely-used collaborative filtering recommendation system in e-commerce that influenced today's 'customers who bought this also bought' features?

The way we shop online has been transformed by recommendation systems that seem to know what we want before we do. These AI-powered tools have revolutionized retail by analyzing our behavior patterns and purchase history. But do you know when and how these powerful recommendation engines first emerged in mainstream e-commerce? Test your knowledge about the origins of the technology that changed online shopping forever!

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Amazon, with its item-to-item collaborative filtering system launched in 1998
eBay, with its BiddingBuddy system introduced in 1997
Netflix, with its Cinematch algorithm developed in 2000
Yahoo!, with its PersonalShopper technology released in 1996