Which language learning platform's 2012 product launch introduced gamification that revolutionized the industry with its 'streak' feature to maintain user engagement?

In the world of language learning apps and platforms, branding and product launches can make or break success. This poll tests your knowledge about a significant linguistic product launch that changed how millions approach language learning. The correct answer represents a pivotal moment in educational technology that combined effective branding with innovative language acquisition methods.

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Duolingo
Rosetta Stone's TOTALe
Babbel's Speech Recognition Suite
Memrise's Mems System