Which language learning platform first introduced 'gamification' with points, levels, and rewards as core features of its product launch in 2011?

The intersection of language and retail has created fascinating product innovations and marketing strategies. Language learning apps, translation services, and linguistic tools have revolutionized how we communicate globally. This poll tests your knowledge about a significant product launch that changed how we interact with language in the digital age.

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Duolingo
Rosetta Stone
Babbel
Memrise