Which innovative recommendation system, launched in 1998, revolutionized online retail by introducing the concept of 'collaborative filtering' on a mass scale?

Before modern data-driven recommendation systems transformed shopping, retailers relied on various methods to suggest products to customers. The evolution of recommendation techniques has a fascinating history that shaped today's sophisticated algorithms and personalized shopping experiences. Test your knowledge about the historical development of retail recommendation systems and how they've evolved over time.

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• Amazon's 'Customers Who Bought This Also Bought'
• Walmart's 'Personal Shopper' system
• IBM's 'Smart Cart' technology
• eBay's 'Related Items' algorithm

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