Duolingo shares have jumped this week, as the number of Americans learning Mandarin on the app has soared 216%. That's as China's RedNote is now the most downloaded free app on Apple's App Store ahead of the TikTok ban.

Welcome back to Week in Review. This week, we’re looking at the impacts of the looming TikTok ban in the U.S., including the “TikTok refugees” moving to

Millions are joining RedNote ahead of the TikTok ban. But the app’s default language is Mandarin. “Oh so NOW you’re learning mandarin,” Duolingo tweeted on Monday.

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

Duolingo capitalized on the sudden interest in Mandarin learning tied to the TikTok ban and RedNote’s rise. Similarly, small businesses can monitor cultural shifts—whether through social media trends, microtrends, news, or industry developments—and adapt their messaging, offerings or campaigns to meet consumer and customer new interests.

The language-learning app Duolingo has seen a surprising trend emerge, the closer we get to the TikTok ban -- there's been a 216% spike in US users learning Mandarin compared to this time last year.

The last scroll for US users of TikTok is nearing, and everyone from content creators to major companies are posting their final goodbyes.

Yes, the language-learning app has been the big winner amid TikTok’s impending demise and it’s mostly due to spite. According to the app, Duolingo has seen a 216 percent growth in users learning Mandarin Chinese over the last year, which is tied to the growing popularity of RedNote.

Walmart, Wendy’s and Duolingo, among other companies, took to TikTok to bid farewell to the more than 170 million Americans who are on the brink of a potential nationwide ban of the app.

Their migration to the app, known as Xiaohongshu in China, has opened up unexpected avenues for cultural exchanges between Chinese and American users. TikTok faces a possible ban on Sunday as the US Supreme Court on Friday upheld a law that could either ban the popular app or force ByteDance to sell TikTok to an American company.

The Supreme Court has upheld a law banning TikTok in the U.S. starting Jan. 19, unless the popular social media platform cuts ties with its China-based parent company. Here's what to know.