Your circle are the ones that give you $ and your friends are the ones that put out
Ok, so, it's kinda like this...
There are Fans, and Friends... In your circle, are all the people you have added - that makes you their "Fan". If they then add you to their circle (becoming also your fan), then you both become eachother's friends.
Hope that helps. If it's unclear, just let me know.
Actually I didn't enjoy it, that's why I moved on to other things too long of wait for feedbacks.
I enjoy the questions and answers better.