Which innovative brand storytelling technique helped J.K. Rowling's 'Harry Potter' series achieve unprecedented global engagement before social media was mainstream?

In the competitive world of publishing, effective brand storytelling can transform a good book into a cultural phenomenon. Publishers and authors increasingly rely on sophisticated narrative marketing techniques to build reader connections beyond the pages. This poll tests your knowledge of how modern literary brands leverage storytelling techniques to create lasting reader relationships and drive commercial success in the digital age.

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Interactive website Pottermore that extended the narrative universe with exclusive content directly from the author
Collaborative fan fiction contests where winning entries became official canon in later books
Augmented reality app that allowed readers to visualize magical elements from the books in real-world settings
Subscription-based monthly delivery of physical artifacts mentioned in the books with accompanying storylines