When you do this, the browser takes you to a text editing area where you compose a message, just like you would do in sending an Email message. This time, however, you have the option of sending a message to a Usenet group. You can also compose an entirely new message and start a new thread if you like. How long a message or posting stays on the bulletin board varies from site to site, but its usually seven to ten days. After that it drops off the board and disappears.
Most Usenet groups are unmoderated , as is also the case with mailing lists.
Some, however, are moderated , just like mailing lists can be. This means that the posting is first sent to a moderator who decides if it is relevant to the stated aims of the newsgroup. If it is, then it is posted. If not, then it is rejected and sent back to you. There are very many Usenet groups in the world and not all are available everywhere.