Which pioneering e-commerce company first implemented a collaborative filtering recommendation system that significantly transformed retail in the 1990s?

The way we shop online has been transformed by sophisticated algorithms that predict what we might want to buy next. These recommendation engines have revolutionized the retail landscape, boosting sales and enhancing customer experience. But do you know when and how this technological innovation first made its mark in retail? Test your knowledge about this pivotal invention in e-commerce history!

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Amazon, with its 'Customers Who Bought This Also Bought' feature in 1998
eBay, with its 'Similar Items You Might Like' system in 1997
Netflix, with its movie preference algorithm in 1999
Yahoo, with its 'Smart Shopping' recommendations in 1996