Which language learning company pioneered the use of 'spaced repetition' as both a product feature and core advertising message, prominently featuring this linguistic concept in their 2012 rebranding campaign?

In the world of language and linguistics, advertising techniques often employ sophisticated linguistic principles to capture consumer attention. From neologisms to phonaesthetics, language professionals carefully craft messages that resonate with target audiences. This trivia question explores how major language learning companies have leveraged specific advertising techniques to create memorable brand identities in the competitive language education market.

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Duolingo
Babbel
Memrise
Rosetta Stone