Which innovative book recommendation algorithm, launched in 1998, revolutionized personalization in literary retail by analyzing purchase patterns rather than relying on demographic data?

In the modern literary marketplace, personalization algorithms have transformed how readers discover new books and authors. Major bookstore chains and online retailers have implemented sophisticated recommendation systems that analyze reading habits and preferences. This trivia question explores a groundbreaking moment in how the arts and literature retail sector approached customer personalization - changing how millions of readers find their next favorite book.

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Amazon's Item-to-Item Collaborative Filtering
Barnes & Noble's ReadSphere
Borders' LitMatch System
Powell's PagePredictor