Usenet is a worldwide distributed Internet discussion system. It was developed from the general purpose UUCP dial-up network architecture.

Standard for interchange of USENET messages
Picturing Usenet: Mapping Computer‐Mediated Collective Action
Netizens: on the history and impact of Usenet and the Internet
You Are Who You Talk To: Detecting Roles in Usenet Newsgroups
You Are Who You Talk To: Detecting Roles in Usenet Newsgroups
Obscenity and Indecency on the Usenet: The Legal And Political Future of Alt.Sex.Stories
Invisible crowds in cyberspace: measuring and mapping the usenet
Observed behavior and perceived value of authors in usenet newsgroups: bridging the gap
Invisible Crowds in Cyberspace : Mapping the Social Structure of the Usenet 1
Invisible Crowds in Cyberspace: Measuring and Mapping the Social Structure of Usenet