@rjl20 Both, in a way! Had to think of a nym by what sprang to my noggin. Isambard Kingdom B was who did that. I claim no strong association to him though.
Mastodon is a "FOSS" social sharing hub. A multi-host substitution for capitalistic platforms, it avoids risking a particular company monopolizing your communication. Pick a host that you trust — you can still talk with all hosts running Mastadon. Any individual can run a Mastodon instantiation and join in this social hub in a jiffy.
@rjl20 Hullo!