I can only put 500 chars in a toot on this server, but I see others posting really long toots, the bulk of which is hidden for me behind a "Read more" link, thankfully.
I'm old enough to remember the BBS days, and this is not a whole lot different than FidoNet, UUCP, BITNET, or other federated forums of years past. Of course those systems had to be store-and-forward because instant high-speed Internet from anywhere at all times was science fiction and reality was often a 2400 baud modem.