Which company pioneered item-based collaborative filtering, a groundbreaking recommendation algorithm that transformed e-commerce by suggesting products based on similar purchasing patterns?

Recommendation engines have revolutionized how retailers connect products with consumers. These sophisticated algorithms analyze customer behavior, purchase history, and browsing patterns to suggest relevant products. Today's advanced systems drive significant revenue for retailers, but their development has been marked by key innovations and strategic acquisitions. Test your knowledge about the evolution of these powerful retail technologies!

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Amazon (with its patented algorithm in 1998)
Walmart (with its ShopTogether technology in 2000)
eBay (with its RelatedItems system in 1999)
Netflix (with its MovieMatch algorithm in 2002)