Okay, I get what you're saying now, but because it's not my sphere, I can't really speak on it. As far as I understand, Google Plus posts everything you post into someone's stream that has subscribed to your posts. However, that person has the ability to show less of a certain circle (which they may put you in) in their main stream, only seeing all your stuff when they go to your stream.
Facebook, has a very secretive and often-changing algorithm which does prevent even normal friends' posts from showing up on each other's walls (that video on my original blog post explains this). It's kind of frustrating, but is really unavoidable. It does make it quite funny when people post those "Okay, I'm going to see how many people read my posts..."
If only they knew.