"First of all, the Chinese are so nice, they're so sweet and so welcoming. They've over here teaching us Mandarin."

As TikTok users in the United States are flocking over to the Chinese video sharing app REDNote, Duolingo has launched a new AI video calling feature to learn Mandarin.

The threat of TikTok going dark in the US appears to have compelled some Americans to start learning Mandarin as they look to communicate on a rival Chinese app. Many Americans are joining RedNote, also known as Xiaohongshu,