Just read this on The Register
Mark Zuckerberg, Google founders Larry Page, Sergey Brin, and a whole raft of Google’s top brass have suddenly activated the privacy settings on their Google+ profiles. (theregister.co.uk/2011/07/13/facebook_google_brass_hide_from_google_plus/)
Even though they want you to expose your entire life to world+dog over the interwebs, they would rather not.
The newly activated privacy settings has made it impossible to see who is following them on Google+.
Information is the key to power, question is, how much information are you giving away? Not sure? Check out this anonymous test to find out if you are leaking personal information as you surf the net! Make sure you take the firewall test as well, they are both completely free.