TikTok is owned by a China-based company named ByteDance. The Biden administration warned the app posed a "grave national security threat" because of its ties to China. Under the law, to avoid the ban, TikTok's Chinese owner had to sell to a U.S. company. The company said they will not sell. Now, the app supposed to banned in the U.S. on Sunday.

As self-described " TikTok refugees" pour onto the Chinese social media app RedNote, also known as Xiaohongshu, some foreign netizens are already running up against the country's extensive censorship apparatus.