Which innovative product marketing strategy helped propel a relatively unknown fantasy series into a global literary phenomenon before the first movie adaptation was released?

The publishing world has seen remarkable evolution in how books are marketed and branded. Behind many bestselling literary works are innovative product marketing strategies that helped them stand out in crowded bookstore shelves. This poll tests your knowledge of groundbreaking marketing campaigns that transformed certain books into cultural phenomena. Can you identify which marketing strategy truly revolutionized the industry?

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J.K. Rowling's Harry Potter series used dual cover designs - one for children and one for adults - allowing different demographics to publicly enjoy the same books
George R.R. Martin's A Song of Ice and Fire series pioneered the use of interactive chapter-by-chapter online discussion forums moderated by the author
Stephenie Meyer's Twilight saga was the first to use character-based social media accounts that interacted with readers in real-time as the story progressed
Suzanne Collins' The Hunger Games trilogy introduced the concept of releasing free prequel chapters exclusively through selected bookstore chains