Duolingo is using machine learning to build a fun, personalized, and effective language learning experience.
Duolingo is using machine learning to help users acquire new lanaguages and verify their current language skills – are broader educational applications for Duolingo's machine learning next?
Duolingo democratizes language learning to create a crowdsourced translation business.
Duolingo claims to provide a social service (language education) for free, all supported by your translation services. Will it become sustainable?