Any of the above? However trevorgrant.me is hosted, as long as it speaks activitypub protocol and so does blackmon.org, your users and mine can discover / follow / mention / message each other.
The official spec does not say for example that a message from one server to another must be delivered within X attempts or Y minutes. So in theory a streams deployment could run on a device with intermittent connectivity and a dynamic dns setup and still function within the network. Steve
