Twitter has been doing so badly since it was acquired by Elon Musk that it's now gone into hiding, reportedly working under the name "X." If I were doing that poorly, I'd start signing my work that way too. I still check in on it now and then. Enough people who post interesting things are still posting interesting things on it but I haven't put a message on there since 1/6/23.
I recently opened an account on Bluesky, which strives to be a quieter, less inflammatory place for social messaging. So far it seems to be that but I must admit to having some trouble with the way it works. When someone reposts a message by someone else, it doesn't identify who the original author was. And I frequently am shown replies to messages but cannot locate the message to which that reply is replying.
I'll give it another few weeks to see if they improve the software or I get the hang of it. If you're a member there, you can follow me there. I'm @evanier.bsky.social but I haven't decided yet if I'm going to stick around. If you're not a member there, you need an invite code to join but I don't have any to give out yet.