You talked with someone or left a message? You transcribed and analyzed it. You got emails? Analyzed and only the advertising got optimized. You surfed to some fancy places? Google already got the big picture of your personality.
In the article Eric Schmidt, Google's CEO, is cited as:
Privately, however, he has told friends to keep off a computer anything they want to keep private.In several European countries there are already discussions about Google and compliance with privacy laws. It will be interesting to see how this moves forward.