With TikTok's days in the U.S. potentially numbered, many American users are moving to another Chinese social media app: RedNote, a heavily censored platform similar to Instagram. Here's what to know.

It holds the top position among the most downloaded social networks in the Apple stores in the United States. Shuang is hooked on an app that many of its followers believe ironically adopted the name of a popular red-covered book full of doctrinal quotes from the founding father of communist China.

TikTok refugees flocked to Chinese platform Xiaohongshu on Monday, where users greeted them with offers of Mandarin lessons and jokes about spying.