Which language learning platform's 2013 advertising campaign famously introduced the catchphrase 'Two owls are better than one' that revolutionized gamified language education marketing?

The language industry has seen remarkable advertising campaigns that have shaped how we communicate and learn languages. Some campaigns have been so influential they've entered our collective vocabulary or changed how language learning products are marketed. Test your knowledge of these linguistic marketing milestones!

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Duolingo
Rosetta Stone
Babbel
Memrise