@Blurry Moon @lain Mastodon has trending hashtags, but I think they are network wide, for the "known network" of that instance. Hashtags could have been really great for trending and tagging posts, but Mastodon ruined it by making the search utterly unusable. Ideally there would also be "local trending tags" and "global trending tags", so an instance has more of a community feeling besides it just being a way to communicate with the whole network. The "instance" being a generic thing instead of a community building block hurts this network I think.