Which product marketing innovation by Amazon fundamentally changed how readers discover books and is credited with boosting sales for countless unknown authors?

The publishing industry has undergone massive transformation in how books are marketed to readers. With the rise of social media, recommendation algorithms, and personalized marketing, the way readers discover new titles has changed dramatically. This poll tests your knowledge about a groundbreaking product marketing innovation that revolutionized book discovery and sales in the digital age.

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The 'Customers Who Bought This Also Bought' recommendation system
Kindle First program offering pre-release titles to Prime members
The Goodreads acquisition and review integration
Amazon's BookSense personalized email marketing system