Which retail recommendation innovation, introduced in 1997, revolutionized book discovery and forced publishers to rethink their positioning strategies?

The publishing industry has undergone dramatic transformations in how books are marketed, sold, and positioned to readers. From traditional bookstores to algorithm-driven recommendations, publishers and authors must navigate complex retail environments to connect with their audience. This trivia question explores a significant retail recommendation innovation that changed how readers discover books and how publishers position their products in the marketplace.

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Amazon's 'Customers Who Bought This Item Also Bought' algorithm
Barnes & Noble's 'Discover Great New Writers' program
Goodreads' social recommendation platform
The New York Times bestseller categorization system