Which language learning app's 2012 product launch revolutionized the industry by introducing 'spaced repetition algorithms' based on linguistic memory research?

In the world of language and linguistics, marketing campaigns often leverage clever wordplay, linguistic research, and cultural nuances to create memorable brand experiences. This trivia tests your knowledge about a groundbreaking product launch that revolutionized how we interact with language learning technology. Do you know your linguistic marketing history?

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Duolingo
Rosetta Stone Mobile
Babbel
Memrise