Each site may be as selective as it wants in allowing the reception of individual groups into its system. Most newsgroups are unmoderated, meaning that contributors post anything they want without any review. In general, the only form of judgment on content is by peer pressure from other group participants. A key observation is that there may not be a point where any systematic review of material can occur before it is available for world-wide reading. Postings can arrive from any point in the world which has computer access to Usenet.
Most groups are unmoderated.
The Usenet newsgroups generally come into campus over a high- speed data network called the Internet. Connected to the NSF backbone are regional high-speed networks formed for the purpose of providing access to the NSF backbone. Iowa State belongs to and uses the facilities of MIDnet, a seven-state regional network. A significant share of the support structure for distributing Usenet News is derived from public funding. Usenet News could not function at the current level without the existing public-funded infrastructure.