What is known as the "Big 8" creates and removes groups of the following types:
* comp.* Computer topics, both hardware and software.* news.* Administration of the Big 8, as well as about Usenet and Netnews in general, and related topics.* sci.* Science and technology.* humanities.* The humanities.* rec.* Recreational topics, including music, sports, games, outdoor recreation, hobbies, crafts, ...* soc.* Socializing, society, and social issues.* talk.* Endless discussion, largely about politics.* misc.* A mixture of newsgroups that don't fit the other 7 hierarchies. Many are about the practical aspects of everyday life.<ref>http://www.big-8.org/wiki/Big-8_Usenet_hierarchies</ref>
They do not moderate these groups, and only convention followed by Usenet providers prevents the creation of "Big 8" groups, moderated nature of groups, and refusal to carry such groups.