Which company pioneered the first large-scale commercial implementation of collaborative filtering recommendation systems in retail, forever changing how we discover products online?

Test your knowledge about a technological breakthrough that transformed how we shop online! In the world of e-commerce, recommendation systems have become ubiquitous, suggesting products we might like based on our browsing history, purchases, and similar customers' behaviors. But do you know when and how this technology first emerged in mainstream retail? This question explores a pivotal invention that changed the face of online shopping forever.

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Amazon, with its 'Customers Who Bought This Item Also Bought' feature in 1998
Netflix, with its movie recommendation algorithm in 1999
eBay, with its 'Similar Items You Might Like' system in 1997
Google, with its product recommendation search feature in 2000