Which marketing campaign is credited with transforming Duolingo from a niche language learning app to a mainstream educational platform with over 500 million downloads?

The language learning and linguistics industry has seen tremendous growth with innovative marketing campaigns that changed how we perceive language acquisition tools. Some campaigns have become iconic in the industry, creating lasting impressions and driving significant market shifts. Test your knowledge about a groundbreaking marketing moment that transformed a language learning company's trajectory.

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The "Language Owl" campaign featuring the now-iconic green owl mascot Duo with push notification reminders
The "Speak Like a Local" campaign featuring celebrities demonstrating their language skills in foreign countries
The "Translation Nation" campaign that paid users small amounts for contributing to translation databases
The "Global Village" campaign that partnered with UNESCO to preserve endangered languages