Some U.S. TikTok users have flocked to the Chinese social media app Xiaohongshu, or RedNote, in protest of the looming ban.

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.

As the potential ban on TikTok, a cultural sensation, approaches, here’s what you need to know about Xiaohongshu and other apps that social media users are considering.