that are public will appear in your list of toots, in your followers' Home timelines, in the public local and federated timelines, and in the Mentions of anyone you mention by username. Your *replies* that are public will appear in your list of *toots and replies* (*not* the primary list of toots; it's a separate list!), in the Home timelines of any of your followers who *also* follow the person you're replying to, and in the Mentions of anyone you mention by username.
* **Unlisted** means that everyone can