Which groundbreaking recommendation system, launched in 1998, first used collaborative filtering at scale to suggest products to customers based on the purchasing patterns of similar users?

Before AI and big data transformed how we shop, one pioneering technology changed retail forever by introducing personalized recommendations at scale. This innovation fundamentally altered how consumers discover products and how businesses understand their customers. Test your knowledge about this revolutionary system that paved the way for the recommendation algorithms we encounter daily.

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Amazon's 'Customers Who Bought This Also Bought'
Netflix's Cinematch algorithm
IBM's Watson Shopping Assistant
eBay's Related Items Feature