The mod account (etrangestorm) has an FAQ. You must keep reading and scrolling to find it. Somewhere in one of the FAQ, she tells you which are some (not all) of the existing comms, how to join them etc.

I normally access kakenukero from the mod account because for me, the mod account works like the contents page, introduction, preface, acknowledgement sections of a book. But that's just me and I'm weird. Most people just head to the kakenukero comm straight and click around hoping to find what they want.