Usenet

Usenet is one of the oldest parts of the Internet.

It consists of discussion groups called "newsgroups". Servers propogate messages in a peer-to-peer fashion. Clients connect to servers to read and post to newsgroups.

Access to Usenet is tolled. Many participants are stuck using http://groups.google.com to read and post.

Usenet hierarchy

 * rec.
 * rec.games.
 * rec.games.hack
 * rec.games.roguelike.
 * rec.games.roguelike.nethack

On other wiki

 * UseNet