Which linguistic technique did Duolingo incorporate into its brand storytelling in 2019 that reportedly increased user engagement by 47%?

Brand storytelling has evolved dramatically in the linguistics space, with language patterns and terminology adapting to new market demands. Companies that sell language learning products, translation services, and linguistic tools have developed unique storytelling approaches to differentiate themselves. This trivia question explores how a major language learning platform revolutionized its brand narrative through a specific linguistic technique.

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Narrative Transportation (using immersive story scenarios where learners become characters in stories set in target language cultures)
Semantic Framing (positioning language learning as 'unlocking' rather than 'studying', shifting the conceptual framework)
Linguistic Relativity Marketing (emphasizing how different languages reshape thought patterns and worldviews)
Code-Switching Narratives (featuring multilingual characters who naturally switch between languages in brand stories)