Which innovative product design feature was first introduced by Duolingo that revolutionized mobile language learning and has since been widely adopted by competitors?

In the world of language learning apps and platforms, branding strategies often incorporate linguistic elements to create memorable identities. This poll tests your knowledge about how language education companies have positioned themselves in the competitive market through innovative product design and marketing approaches. Can you identify which revolutionary product design feature truly changed the language learning landscape?

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Gamified learning with experience points and leaderboards
Speech recognition for pronunciation practice
Spaced repetition flashcard system
Virtual language exchange with native speakers