Which language learning platform first introduced a 'streak' feature for customer loyalty, gamifying daily practice to increase user retention?

In the language and linguistics industry, branding strategies often leverage fascinating linguistic principles to create memorable identities. Major language learning platforms, dictionaries, and linguistic service providers carefully craft their brand identities through color psychology, naming conventions, and positioning. This trivia tests your knowledge of how major linguistic brands have developed their market presence and loyal customer bases through strategic decisions.

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Duolingo
Rosetta Stone
Babbel
Memrise