Mastodon has a section called Explore which shows trending posts and hashtags.
- On your server’s website, just click on the # Explore link on the right to see trending posts, tags and links. You don’t need to be logged in, and you can even browse Explore on other servers’ websites if you like. The trending posts and tags on different servers will be slightly different as they have different views of the Fediverse. You do need to be logged in if you want to interact with the posts, however.
- On the official Mastodon apps click on the magnifying glass at the bottom of the screen and it will show you trending posts, tags and news by default (there’s also a Community tab which shows the latest public posts on your server). Don’t type or click anything in the search box, otherwise it will try to find items related to a search instead.
Third party apps may display trends in various different ways using their own interfaces.