It's not too far off. On Hubski, the content you see is based on who you follow (people and/or tags). Importantly, you don't just get the posts of the people you follow, but the posts they share with you. (you might be interested in following someone that doesn't post at all, if they find and share quality posts). Likewise, posts you share go to your followers. -You can share and unshare.

My thinking on Hubski has been guided by the idea that groups should form and dissolve as people wish, and that Hubski become a multitude of overlapping and ever-changing groups. As user following-relationships are color-coded (http://hubski.com/about), you tend to build a familiarity with a number of people that are connected with you this way.

IMO it's not just content that should be the result of choice, but also how familiar you want to get with members of the community. I'm currently doing more work to this end.

In a nutshell, I feel effort is best spent enabling users to build and break boundaries and groups as they are wont to. -It's not as important that you behave as I would like you to, if I can easily avoid you.