Which author's 1920s book tour innovation is considered one of the earliest examples of influencer marketing in literature, where they partnered with celebrities to endorse their work?

Before social media, authors and publishers pioneered innovative influencer marketing techniques to boost book sales and literary reputations. This trivia question explores a groundbreaking early example of literary influencer marketing that revolutionized how books were promoted. Test your knowledge of the intersection between literary history and marketing innovation!

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F. Scott Fitzgerald, who had silent film stars pose with 'The Great Gatsby' at premieres
Ernest Hemingway, who collaborated with bullfighters to promote 'The Sun Also Rises'
Gertrude Stein, who had famous painters create artworks inspired by her poetry for exhibitions
Virginia Woolf, who hosted literary salons where aristocrats reviewed her books to society pages