Which pioneering recommendation system invention, first implemented in 1998, revolutionized e-commerce by introducing collaborative filtering that could suggest products based on similar user preferences?

The intersection of invention, discovery, and retail has transformed how we shop. One particular technology revolutionized product discovery and recommendation systems, changing the way retailers understand customer preferences and suggest products. This invention combined data science with retail strategy to create personalized shopping experiences that were previously impossible. Test your knowledge of this pivotal moment in retail technology history!

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Amazon's item-to-item collaborative filtering algorithm
Google's PageRank product recommendation system
eBay's BiddingBuddy suggestion engine
Yahoo's ShopSense preference matching technology