We've just released our "Circles" feature on our blogging platform GoNevis.com
It's pretty much like the functionality of Google+ Circles but with less annoyance (like not adding anyone you want to your circles and disturb the hell of them),
Our bloggers asked us a way to publish posts internally between their team members (work, friends, private, ...) and the idea of Circles was pretty much what we needed. Worth noting, Circles is a way for us to publish content internally in the team as well.
Appreciate your feedback and suggestions.
Blog post: https://blog.gonevis.com/circles/