Which groundbreaking feature did Amazon's book recommendation system introduce in 1998 that revolutionized online book retail?

In today's digital reading landscape, recommendation systems play a crucial role in how we discover new books and authors. Major online bookstores and reading platforms use sophisticated algorithms to suggest titles based on our reading history, preferences, and browsing behavior. But how much do you know about the technology that's shaping your literary journey? Test your knowledge about one of the most innovative recommendation systems in the book retail space!

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• Collaborative filtering (the 'Customers who bought this also bought' feature)
• Sentiment analysis of book reviews to generate personalized recommendations
• Automated book summary generation for quicker browsing
• The 'Look Inside' feature that allowed readers to preview book content

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