The jupyter socials list appears to be actively maintained by JMS as Twitter was recently removed. It lists a slack workspace:

I would be curious to learn more about it! Is it private? Is it public? If so how can I sign up? I tried but failed:

I am also curious in the context of some companies previously suggesting using slack for communication on projects (like jupyter-ai); if this has to happen, maybe using that workspace could at least allow maintainers to have some visibility into it? I don't know. But I guess JMS must have discussed the use of slack before since it is on that list.