Which 1990s marketing innovation is credited with transforming the Harry Potter series from a moderately successful children's book to a global publishing phenomenon?

The publishing industry has seen some revolutionary marketing campaigns that transformed books into cultural phenomena. From innovative promotional stunts to groundbreaking market research that identified new reader segments, publishers have constantly evolved their approach to connecting books with audiences. Test your knowledge of these landmark moments in literary product marketing that changed how we discover and consume literature.

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The creation of adult edition covers, allowing older readers to enjoy the series without the stigma of reading children's books
The simultaneous worldwide release events with midnight store openings, which began with the first book in the series
The early adoption of social media campaigns on MySpace and Friendster that created viral buzz
The exclusive partnership with Barnes & Noble that gave the retailer a one-month exclusivity window for each new release