I’ve just cancelled my Medium subscription. I was finding myself going there less and less. So many articles saying the same thing in various levels of broken English.

ActivityPub and WhatsApp

You will sign up to an instance. On this instance there will be local communities. Kinda like going to your local shopping mall. But you don’t need to be limited to that. You can select ‘all’ and it’s like all the local communities (from all of the federated instances) are visible to see.