Snapchat - does it even exist anymore? It had its time, but personally I don't know anyone still there.
Same with Facebook Messenger, which has completely been replaced by WhatsApp in my (non-nerd) circles.
I thought about including TikTok but it would be more in the
- YouTube, TikTok, Vimeo, PeerTube
category. To me, these are borderline social media and more akin to television - pure consumption, heavily discouraged participation. Just look at the comments on any of these for a proof.
I'd give you Instagram, it seems immensely popular and intensively used as a communication platform.
If we disregard our own bubbles and go strictly by popularity we should have considered WeChat and Douyin too, I guess.
I can't say overall, but my children and their friends use snap as their first line of communication, with iMessage a close second.
It's the primary mode of group communication for my teenage daughter and everybody in her social circles. Second place is probably Discord, but that is heavily skewer towards people she knows via gaming.
None of the other ones that you listed are popular in the US either with the exception of Twitter, Zoom and Slack (and the latter two aren't social media platforms).
I say this as someone who used it exclusively for 5+ years before giving up and using WhatsApp.
There is hardly even a comparison between Signal and WhatsApp.
Downloads != users.
The rest I know. And I do read Hacker News...
Speaks a lot as to the changing sands of time.
Neither is WhatApp, Discord, Slack and many of the other ones mentioned (yes you can interact with them via a website, but the same is true for IRC)