what don't you understand exactly?
how does this work exactly?
I joke I joke... I'm a bit confused too, but its got some cool features all the same... they're still only testing it anyway.
People cannot see what circle you've placed them in. And when you post you can choose which circles see it. One of my major gripes about facebook is once you post everyone can see it. Why circles? meh.. roundy and shit y'know