Basic terminology for talking about 1999.
The place where you create and edit posts is called the editor.
Each item is rendered onto a story page.
People can reply to a story.
The most recent stories are displayed on the home page.
Stories are published or not. By default all stories are published, but there's a setting that makes them not-published by default.
All your published stories appear in your RSS feed.
The collection of all your posts is called a chatlog, in some places a blog.