Which language learning app's marketing campaign first popularized the phrase 'five minutes a day' as a sustainable approach to language acquisition, leading to widespread industry adoption of microlearning?

In the world of language and linguistics, marketing campaigns have played a crucial role in how we communicate about language learning and linguistic services. Some campaigns have been so impactful they've changed how entire generations approach language acquisition or translation services. Test your knowledge of groundbreaking linguistic marketing moments that shaped the industry!

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Duolingo with its 'Five Minutes, One Lesson' campaign in 2013
Babbel's 'Language in Minutes' initiative launched in 2015
Rosetta Stone's 'Minutes to Fluency' program from 2010
Memrise's 'Daily Five' campaign started in 2016