I’m not sure what you mean. There is a list feature much like the one that existed on Twitter, but since I don’t use it, I don’t know if you can share lists.
Edit: I tried the List feature and it does not work like on Twitter (at least the way I remember it): it only can only contain users you already follow and is private. It acts more like a feed with only a subset of your follows.
Oh no, but it’s a neat feature, I wish Mastodon had it!