Which language learning platform first pioneered the 'streak' loyalty feature that gamified daily practice and significantly reduced user churn rates?

In the world of language learning apps and platforms, marketing strategies have evolved dramatically over the past decade. Companies have leveraged unique advertising approaches, celebrity endorsements, and innovative loyalty programs to stand out in this competitive market. This trivia question focuses on a groundbreaking marketing campaign that changed how language learning products position themselves to consumers.

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Duolingo
Babbel
Rosetta Stone
Memrise