Ask HN: What, if anything, could replace Twitter?

From where I'm sitting, dissatisfaction with social media platforms in general is at an all-time high. Twitter is in a lot of turmoil right now. Whatever its numerous flaws, I use it a lot for information about things I care about. If you curate who you follow, it can be great for discovery. If Twitter is going down like some people think, what takes its place? Will it be more than one platform? Will other platforms take up some of its functionality? Will it just go extinct with no replacement?