Which retail innovation, launched in 1997, revolutionized book marketing by introducing an algorithm that suggested "Customers Who Bought This Item Also Bought" recommendations?

In the intersection of literature and retail marketing, certain brand strategies have revolutionized how books are marketed and sold. This poll tests your knowledge about a significant innovation in literary retail that transformed how readers discover and purchase books. Think about how technology, brand strategy, and literary retail have converged to create new marketing paradigms.

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Amazon's collaborative filtering recommendation system
Barnes & Noble's "Discover Great New Writers" program
Borders' "Make Book" personalized publishing service
Goodreads' social reading recommendation platform