FutureLawyer (Our Man in Florida) encourages all of us to password protect our Google activity. An excerpt:
I am frustrated that many of my suggestions for computer security are ignored by many of you. For example, asking you to add two factor authentication to your Facebook access is like yelling down a dark hole. Then, when you are hacked, you come looking for solutions. I hate to break it to you; but, coming to me AFTER you have been hacked is like closing the barn door after the animals are out. So, when I tell you that there is another security in your browser, I know that many of you aren't paying attention. If you are, and you have read this far, click the link and add a password to your Google Activity page.