Everyone just shows up in the same feed. USians are making posts in English alongside all the posts in Chinese. I've seen Chinese users making jokes like "Give me your data!" or "Welcome, I'm your new Chinese spy". I saw one comment on a post that read, "They better start posting in English soon." which, was getting heavily flamed. Lots of Luigi posting, it would seem. I also keep getting Chinese accounts posting a lot of really cool Socialist Realism art/propaganda posters, old and new. Lots of cringe USians making posts about being "refugees" on the app.
After "big" events (at least as american reporting) I like to see what chinese commenters think about them, I might have to get the app just for that. I remember like a day or 2 after "the Adjuster" there were some comments confused about why Brian Thompson/CEO was killed and shouldn't the killer be going after shareholders which I thought was funny but also has its own insight from being further from the situation (pretty sure Brian was a big shareholder anyways)