Many Americans decided to take crash courses in Mandarin using Duolingo, the famous language-learning app featuring a passive aggressive green owl, prompting the company to joke about the 216% ...
Still, not everyone loves it. When Duolingo's head of product, Cem Kansu, posted a thread in 2020 about the success of "the passive aggressive reminder," several unhappy Duolingo users chimed in.
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