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To create a private thread, pass `visibility: "private"` to `Composer` or `useCreateThread`. To access who can see it, there's a couple of ways to do it…

…the easiest way is to add a group to your room and remove their private comments access, like I'm doing here with `reader`. Then pass the `reader` `groupId` to a user when authenticating, and they won't be able to view private comments!

When rendering your threads, check for `thread.visibility` to render private threads differently, like in the video above.