Usenet in the Internet early days when the net was not filled with spam. https://en.wikipedia.org/wiki/Usenet

IRC before Slack took off. IRC a standardized chat protocol, there is not chat islands.

Gopher, the text version of meta browsable Internet before World wide web. You could navigate gopher with just a keyboard. https://en.wikipedia.org/wiki/Gopher_%28protocol%29

BBS Bulletin Board systems there were local computer communities formed around them. https://en.wikipedia.org/wiki/Bulletin_board_system