I've been in contact with Jen Easterly, the head of US CISA, this morning and they'll be creating accounts here. There is an account, @cisacyber, that is legitimately owned by CISA, though they're early in the setup process, so please, don't report them for impersonation.
@jerry @cisacyber Thank you for the "heads up"
For some values of "list", i think it would make sense to have an authoritative list of official accounts. how/where... that's above my pay grade
Giving it a follow so that as they get it set up I'm already watching