What was the original purpose behind the creation of Duolingo before it became a commercial language learning app?

Language learning apps have revolutionized how people approach foreign languages. Among these digital platforms, Duolingo stands out as one of the most recognized and widely used language learning tools worldwide. But how much do you know about this linguistic tech giant's beginnings? Test your knowledge about the origins of this influential language learning platform that transformed the accessibility of language education through gamification and mobile technology.

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It was designed as a university research project to translate the internet while teaching languages
It was created as a vocabulary flashcard app for diplomatic translators
It began as a social network for connecting native speakers of different languages
It was initially developed as educational software for elementary schools