Which language learning app first introduced the concept of 'streaks' as a gamification technique to keep users engaged on a daily basis?

The language learning industry has grown exponentially in recent years, with companies employing innovative branding and marketing strategies to stand out. Beyond just teaching vocabulary and grammar, these brands have created distinctive identities through clever marketing, memorable logos, and compelling brand stories. Test your knowledge of language learning brand history and marketing tactics with this challenging trivia question!

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Duolingo
Babbel
Rosetta Stone
Memrise