Duolingo Expands Offerings as It Prepares for IPO

Duolingo Expands Offerings as It Prepares for IPO

The way that Duolingo, the popular language-learning app, hounds you to keep up your daily lessons has become a meme. But it’s so insistent for a reason. Being addictive is basically the app’s entire business model. The lessons, which are designed to be as game-like...
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