Which groundbreaking marketing strategy revolutionized book sales in the late 1990s and early 2000s, leading to unprecedented sales for previously unknown authors?

The publishing industry has undergone dramatic transformations in how books are marketed and sold over the decades. From traditional bookstore placements to modern digital campaigns, publishers have employed increasingly sophisticated marketing strategies to reach readers. This trivia question explores a pivotal marketing innovation that changed the literary landscape and how readers discover new books.

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Oprah's Book Club endorsements that turned obscure titles into instant bestsellers
Amazon's personalized recommendation algorithm for books based on previous purchases
The Harry Potter midnight release parties that created a cultural phenomenon around book launches
Barnes & Noble's 'Discover Great New Writers' program for emerging authors