Give Mastodon a threaded view and technically it's the same as reddit, but federated? Usenet, but not just for nerds.
As I’ve said elsewhere in this thread, moving text around on the Internet has been a solved problem ever since NNTP. And that was 1986!
The only problem is that there’s not a lot of money in it, which is why having the ability to federate a bunch of smaller services together is such a good solution (at least on a technical level).