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.