@ottocrat @Frances_Coppola - That's "econtwitter" not wanting to pay Mastodon a fee, or have I misunderstood? Mastodon seems confusingly decentralised in its mammoth family tree, I just took the most obvious branch: for interpersonal/public social media use. But I suppose if you are looking for a professionally specific definition of Mast (is "econtwitter" that?), it may be someone asks someone else tfor a fee, tho for what special(ist) services I don't know. Does e.g. BSky help in that regard?