Adding content just to see it work
I've cleaned up the front page. There was too much "just testing" content, and the default settings had it promoted to the front page.
If you just want to see Drupal for Facebook work, or you want to see how a particular piece of markup will look, then post a forum topic in the Test Content forum.
Or, create a story. Starting now, it won't be published to the front page so most likely nobody else will see it.