Duolingo, the popular language-learning app, appears to have developed an interesting new feature, according to some users. Social media has been alight with language learners claiming their Duolingo ...

It's the go-to language app for millions of people around the world. But it appears that Duolingo has crashed this afternoon.

Duolingo's Learning and Investment Flywheels give it huge competitive advantages. DUOL's market leadership in language learning will continue to propel its growth. The company's business model of ...