Which innovative marketing strategy did Duolingo first implement that revolutionized language learning app promotion and has since been widely adopted by competitors?

Marketing strategies in the language industry have evolved significantly over the past decade. Companies developing language learning apps, translation services, and linguistic tools employ various techniques to stand out in this competitive market. This poll tests your knowledge about a groundbreaking marketing approach that transformed how language products are promoted to consumers worldwide.

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Gamification with streak counters and competitive leaderboards
AI-powered personalized email campaigns based on learning patterns
Celebrity linguist endorsements with social media takeovers
Subscription-based premium content with monthly linguistic challenges