Which famous product's marketing campaign in the 1920s pioneered the concept of 'testimonial advertising' by featuring celebrities and changed advertising history?

Throughout history, certain products have revolutionized not just industries but also the way they were marketed to consumers. Before digital marketing and social media, companies had to be incredibly creative with their product promotion strategies. This trivia question explores a pivotal moment in product marketing history that changed how companies would advertise for decades to come.

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Coca-Cola with famous athletes
Lux Soap with film stars
Ford Model T with business tycoons
Wrigley's chewing gum with baseball players