Which famous language learning platform popularized the tagline 'Language learning, gamified' and pioneered the use of game mechanics in language acquisition?

In the world of language and linguistics, marketing taglines often employ fascinating linguistic devices like alliteration, metaphor, and clever wordplay to create memorable brand impressions. These linguistic patterns help taglines become embedded in our cultural lexicon. Test your knowledge of famous taglines that have made significant linguistic contributions to our everyday language!

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Duolingo
Rosetta Stone
Babbel
Memrise