Which language learning product famously introduced 'gamification' to language acquisition, leading to over 500 million downloads and changing how consumers approach language learning?

The way we communicate has dramatically changed with technology. Language learning apps and digital tools have revolutionized how people acquire new languages and improve their linguistic skills. This poll tests your knowledge about a significant product launch that changed the language learning landscape and influenced consumer behavior in language acquisition.

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Duolingo (2011)
Rosetta Stone Interactive (1992)
Babbel (2007)
Pimsleur Digital (2003)