[celticjames]

With G+ it's possible to filter your output (into circles) but there's no way to filter the input. I've put all my hacker friends into a hacker circle, but when I browse that stream I get all their public/extended posts plus the posts for whatever circle they've put me in. Basically, they know I'm following, but they can't know why I'm following. I can't signal to them that I want them to put me in circle for all their hacking posts and not their pictures-of-cats posts.

I've actually started making posts that say, "If you can see this post, I'm following you because [X]."