What if you could control this based on the URL you used to access the hub? So if I am a blogger I go to http://www.bsgalliance.com/public (or something) and whatever I post defaults to publicly viewable and http://www.bsgalliance.com/internal does the opposite? People could just bookmark whatever mode they usually use.

I think you usually know what you want before you start your post. 

 Just throwing out ideas...