The Network News Transfer Protocol (NNTP) provides bulletin board services. Unmoderated newsgroups can be posted to directly, but postings to a Moderated newsgroup must first pass through the newsgroups filtering "Moderator". Local newsgroups exist on an individual (local) server. Global-newsgroups exist in the "cloud", with their messages being distributed to participating relay servers (be aware that a "thread" may occasionally loose a portion if your preferred relay server temporarily becomes isolated). The Usenet newsgroups (sometimes referred to as the "Big-8") are famous examples of globally-relayed bulletin boards. Server access (global-newsgroups being offered are always at the discretion of the individual Relay Server maintainer, and may be set to "read-only") requires using a NNTP News Reader client, or a Browser that understands the URI "news://". Just copy & paste the full newsgroup address into your News Reader. Below are addresses to various publicly open free NNTP servers.
[IANA Port assignment = 119]

NOTE: All public messages originating on the non-Internet mail networks known as CL-Net, Fido7, FidoNet, MausNet, and Z-Net, are currently being reflected (read-only) to the Internet via NNTP gateways.