There it is. The exact widget you were looking for, or maybe it's a plea from another person for information that you can answer. Perhaps even a desire to tell the latest joke you heard. Well, not quite. We need to explain a fact or two before you start posting.
All messages are subject to a propagation delay.
Simply put, your message, depending upon the route it takes, could take several hours or several days before becoming visible to you in the Newsgroup. Your message leaves your computer and is passed from server to server, until it reaches the primary repository for all of the messages for that Newsgroup. At that time the server would add the message to it's database, then start updating the other servers. To conserve bandwidth on the Internet, there are many Newsgroup servers, but only one master location for each Newsgroup. That master server controls the content of the message list for one or more newsgroups.