(posted on my G+ wall last week, but I thought it might be worth pasting over here also)
There’s something creepy about Google+. It’s not so much what is seen on the surface. You have the power to manage your own user profile, the people you add to your circles, and what you want see. What you don’t have control over are the circles you are placed into by everyone else.
As users become more familiar with Google+, they will begin to create more specialized circles. For example, a sampling of circles I have currently have configured are "friends, family, acquaintances, following, paraglider pilots, hackers, makers, the press, ceo’s." Someone else might have me classified in their circles under “pilot” or “robot hacker” or “exboyfriends” or “high school buddies”. Whenever someone adds you to a circle, they are essentially profiling you, and the more people who add you to their circles, the more detail the profile about you will become. This is not something visible to you nor I. It’s visible only to the wizard behind the curtain (Google) and whoever they wish (or are forced) to share this information.
In the near future, ads may be served which relate to you, yet have nothing to do with anything you ever posted or mentioned on the internet. Your Google+ friends have inadvertently ratted you out.
So, who is really in control of your profile?