Which innovative advertising campaign is credited with transforming a literary work into a bestseller by using the first major viral marketing strategy in publishing history?

In the competitive world of publishing, innovative advertising campaigns can make or break a book's success. Throughout literary history, certain marketing strategies have revolutionized how books reach audiences and become cultural phenomena. This poll tests your knowledge of groundbreaking advertising techniques that transformed relatively unknown works into bestsellers and classics. Can you identify the pioneering campaign that changed publishing forever?

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The 1997 'Midnight Magic' parties for Harry Potter, where bookstores opened at midnight for eager readers
The 2003 'Da Vinci Code Quest' puzzle contest that engaged readers in solving clues related to the novel
The 1999 'Blair Witch Project' campaign that used a fake documentary and missing persons website to blur fiction and reality
The 1970 'Love Story' campaign where publisher Erich Segal strategically released excerpts in Ladies' Home Journal before publication