Which online book retailer innovation from the late 1990s revolutionized literary product discovery by introducing the first widely successful collaborative filtering algorithm for personalized recommendations?

The way we discover, purchase, and consume literature has transformed dramatically in the digital age. From the rise of e-books to the evolution of online bookstores, the literary retail landscape continues to shift. This trivia question explores a pivotal moment in book retail history that changed consumer behavior and industry strategies forever. Test your knowledge of how technology has disrupted traditional book selling and reshaped reader purchasing patterns.

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Amazon's 'Customers Who Bought This Item Also Bought' feature
Barnes & Noble's 'Recommended Reading' system
Borders' 'Personal Shopper' digital assistant
Book Depository's 'Literary Matchmaker' tool