Which groundbreaking marketing approach did Duolingo pioneer that revolutionized language learning app engagement?

In the world of language learning apps and linguistic tools, marketing strategies often employ fascinating psychological principles to attract users. This poll tests your knowledge about one of the most successful marketing campaigns in language learning technology that revolutionized how companies position their products in this competitive space. Can you identify the innovative approach that changed the industry?

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The gamification system with streaks and competitive leaderboards
The subscription-first model with premium content tiers
The immersion-based approach with native speaker videos
The B2B enterprise focus targeting corporate language training