I don’t think there’s a single person who “runs” Pangeo social media. When I needed access to twitter for organizing this fall’s showcase talks, @rsignell set me up with access.
I also hear you and dislike logging on to twitter to announce the showcases. I would love if the community moved to BlueSky + LinkedIn. I know in the past new platforms for Pangeo have been added with minimal process (e.g., Pangeo chat (Discord, Slack, Zulip, Element, etc.)?), but I’m not sure if the same decision making approach would apply for abandoning twitter 
Somewhat relatedly, I created https://github.com/pangeo-data/bus-factors to identify risks and make it simpler for contributors to find points of contact for various Pangeo resources, though there’s a lot of remaining triage needed.