Which language learning product launch introduced the first successful gamified language acquisition system, resulting in over 500 million downloads and creating the term 'streaks' for continuous learning?

Language learning apps and tools have revolutionized how people approach mastering new languages. Behind these successful products are fascinating launch strategies, market disruptions, and sometimes surprising outcomes. Test your knowledge about one of the most significant product launches in the language learning industry that changed how millions approach linguistics.

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Duolingo (2011)
Rosetta Stone Mobile (2009)
Babbel (2008)
Memrise (2010)