Which groundbreaking advertising innovation of the 1920s was first used by Hazel Bishop cosmetics and revolutionized product marketing by bringing celebrities directly into American homes?

In the early days of mass marketing, companies were constantly searching for innovative ways to reach consumers. One particular advertising technique revolutionized how products were marketed and became a watershed moment in advertising history. Test your knowledge of this pivotal historical development that changed how companies connected with consumers forever.

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Television commercials featuring movie stars
Radio endorsements by famous personalities
Billboard advertisements with celebrity photographs
Magazine spreads with celebrity testimonials