Which retail innovation is credited with fundamentally changing book discovery by introducing the 'If you liked this, you might also like...' recommendation algorithm to mainstream book buying?

The book industry has undergone massive transformations in how literature reaches consumers. From traditional bookstores to digital platforms, the customer experience in accessing literature has evolved dramatically. This poll tests your knowledge about a significant retail innovation that changed how millions of readers discover and purchase books. Think about how technology and retail strategy intersected to create new literary consumption patterns.

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Amazon's collaborative filtering system, first implemented for books in 1998
Barnes & Noble's 'Readers' Circle' program launched in 2003
Borders' 'PersonalPath' shopping assistant kiosks from 2001
Goodreads' initial recommendation engine from 2007