Which e-commerce giant first implemented item-to-item collaborative filtering, a groundbreaking personalization algorithm that revolutionized product recommendations in retail?

The retail landscape has been transformed by technology that tailors shopping experiences to individual customers. Personalization algorithms now power many of our favorite shopping platforms, creating recommendations and experiences unique to each consumer. But when did this revolution begin? Test your knowledge about the origins of retail personalization technology that has fundamentally changed how we shop and how retailers engage with customers.

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Amazon (1998)
eBay (2001)
Netflix (2000)
Alibaba (2003)