Which language learning platform was the first to successfully implement an immersive 'language tree' learning method and spaced repetition algorithm that adapts to individual learning patterns?

The language learning and translation industry has been revolutionized by technology over the past decades. Major brands have pioneered different approaches to language acquisition and translation services, setting trends that continue to influence the market today. Test your knowledge about a groundbreaking product that transformed how we approach language learning!

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Duolingo (2011)
Rosetta Stone (1992)
Babbel (2007)
Memrise (2010)