Which language learning app famously used the 'streak' feature as a marketing and retention strategy, gamifying daily practice to build user habits?

In the world of language learning and linguistic products, marketing strategies have evolved significantly with technology and user behavior changes. Companies employ various psychological techniques to attract and retain language learners. This poll tests your knowledge about a famous marketing strategy that revolutionized the language learning industry and set a new standard for customer engagement and product virality.

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Duolingo
Rosetta Stone
Babbel
Memrise