It was the world's biggest distributed BBS system. Originally, Usenet used UUCP for transport; later on NNTP was defined so Usenet could be shared via TCP/IP.

It was the world's biggest distributed BBS system. Originally, Usenet used UUCP for transport; later on NNTP was defined so Usenet could be shared via TCP/IP. In the early days, only DARPA contractors (which included many university computer science departments) could be on the Internet; second-class citizens could use UUCP and modems.