Which language learning platform's 2012-2013 marketing campaign famously rebranded language acquisition as a gamified experience, using the slogan "Learn a language for free. Forever."?

In the world of language learning and linguistics, marketing campaigns have played a crucial role in popularizing certain approaches, methods, and tools. Some campaigns have been so influential they've changed how millions approach language acquisition. This poll tests your knowledge about one of the most significant marketing pivots in the language learning industry that transformed both perception and adoption rates.

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Duolingo
Rosetta Stone
Babbel
Memrise