facebook notes and posted items

Does anyone understand how notes and posted items on facebook work. I have it set up so that it takes what I post on my blog and makes it into a note on facebook. Do I then have to go to the note and click on share and post the note as well, or is that completely redundant? When it makes my blog post into a note, does it announce it to the world, or does it only do that if I post it as well? or does it announce it to the world twice if I post something that is already a note? Or is there a setting for it to automatically post it?