Which innovative marketing campaign helped Duolingo increase its user base by over 100% in 2020?

Language learning apps have transformed how we approach linguistics education, creating a multi-billion dollar industry through innovative marketing strategies. Behind these successful platforms are fascinating branding decisions and advertising campaigns that have shaped how millions engage with language learning. Test your knowledge about the marketing strategies that helped language learning products achieve mainstream success!

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The "Language Owl" campaign featuring push notification personification
The "Speak Like a Local" campaign featuring travel influencers
The "21-Day Fluency Challenge" with celebrity endorsements
The "Translation Nation" campaign featuring user success stories