Which e-commerce innovation fundamentally changed the book industry in the late 1990s by introducing the first major online algorithm for personalized book recommendations?

The book industry has undergone dramatic transformations in how literature reaches consumers. From traditional bookstores to innovative digital platforms, the retail landscape for literature has evolved significantly. Test your knowledge about the technological and marketing innovations that have shaped how readers discover and purchase books in the modern era.

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Amazon's 'Customers Who Bought This Also Bought' collaborative filtering system
Barnes & Noble's 'B&N Recommends' curated staff picks program
Goodreads' social reading platform and recommendation engine
Google Books' text analysis and genre-matching algorithm