Which language learning platform first introduced adaptive spaced repetition algorithms based on linguistic research to personalize vocabulary acquisition?

The intersection of language and branding has produced some fascinating innovations in how companies communicate with consumers. Specialized dictionaries, translation tools, and language learning platforms have transformed how we interact with language. This poll tests your knowledge about a significant milestone in linguistic product marketing that changed how we think about language learning and accessibility.

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Duolingo (2011)
SuperMemo (1987)
Rosetta Stone (1992)
Babbel (2007)