Which innovative marketing campaign introduced the concept of 'streaks' that revolutionized language learning apps and became widely copied across the education technology sector?

The language and linguistics industry has seen some revolutionary advertising campaigns that changed how people perceive language learning and usage. From apps that gamified language acquisition to marketing strategies that transformed dictionary sales, these campaigns redefined the industry. Test your knowledge of the most influential language product marketing campaigns that shaped consumer behavior in this space.

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Duolingo's 'Fear of Missing Out' campaign with the owl mascot Duo
Rosetta Stone's 'Think in the Language' immersion marketing
Babbel's '15 Minutes to Fluency' daily practice promotion
Merriam-Webster's 'Word of the Day' subscription service