Circles work when I know what kind of posts my friends like and when they know what I like, but what about when we don't know what each other likes? I want to

Circles work when I know what kind of posts my friends like and when they know what I like, but what about when we don't know what each other likes? I want to share my posts with all my friends and have them decide what they want to see. I want to tag my posts or have my friends tag my posts. Then, they can follow my posts with certain tags or hide them from their stream. I want to see what they post in certain circles and join or subscribe. It's like twitter lists, but instead of lists of people, it would have a list of posts.