I genuinely don’t know where I’d head next if HN shut down or otherwise jumped the shark. FB was never a viable option for me, Twitter got Musked, and Reddit never held much appeal. Guess I’d have to learn how to Mastodon.
Mastodon isn't a replacement for forums. People mostly toot past each other; threads don't happen that much. When threads get big they are hard to follow; there is no easily discernible tree structure.