Which language learning platform was the first to pioneer the 'freemium' mobile commerce model with over 100 million downloads, revolutionizing how language products are marketed?

Mobile commerce has revolutionized how language learning products are marketed and sold. As language apps and tools continue to dominate the digital marketplace, companies have employed innovative strategies to stand out in this competitive landscape. This trivia question focuses on a notable marketing breakthrough in the language technology industry that changed how these products reach consumers.

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Duolingo
Rosetta Stone
Babbel
Memrise