[kaiwetzel]

I agree with earlier comments that some more info before signing up would be good. I finally found the "About" link, that's a start. The same sparse info is given if you click on an invitation link.

I think the idea is promising but there are still many usability issues (or bugs). I managed to create a circle, invited a "friend" and added said friend to the circle. No idea, how said friend is supposed to know of that circle or if it is only implicit, i.e. people would never know why they receive a certain status update from somebody? I could not find out because after I finally found the "Logout" link I had forgotten my password, and there seems to be no password recovery option.

After logging out, direct to Login page, not Signup page?

It seems circleriot offers very little at this point and to use what's there you need way too many clicks. I don't think this is a MVP yet but I know many people who are not comfortable using facebook or twitter because they don't want to share everything with everybody (or even want to be discoverd by random people) so I think your idea has potential. Good luck!