"I don't use internet, I just use Facebook and YouTube"
{After describing federation...}...Various independent systems, which might resemble Facebook or X or Instagram or nothing ever seen in commercial social media, have federated and agreed to exchange information via standard communications protocols.What's more, there isn't just one X-like system, there are literally thousands, of various sizes, operated independently, with their own rules and their own local culture. Ditto for systems that are Facebook-like, Instagram-like, etc. ...
it is probably best to cover all the various terms that a reader might encounter. We also hear about nodes, hubs, channels, accounts, profiles, pages...
[spoiler]