Which company pioneered the first large-scale recommendation system in e-commerce that used collaborative filtering to suggest products to customers?

Recommendation systems have transformed how we shop online, suggesting products based on our browsing history, purchases, and preferences. These AI-powered systems have become so sophisticated that they can predict what we might want before we even know it ourselves. But do you know when and how these transformative technologies first emerged in retail? Test your knowledge about the early days of retail recommendation systems that changed e-commerce forever.

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Amazon, with its item-to-item collaborative filtering system launched in 1998
eBay, with its BiddingBuddy recommendation engine introduced in 1997
Netflix, with its Cinematch algorithm first implemented in 2000
Google, with its PageRank-based shopping suggestions in 1999