What scares me the most sometimes is when I think about how ubiquitous Google's ads network and analytics network are. Most of the websites I visit use AdSense and/or Google Analytics. Some are using Google's copy of popular javascript libraries like jQuery. This means that when you are moving from site A to site B to site C, there is a good chance that even though A or B or C does not know about it, Google knows your full browsing path and even how you move from one to another. I am not saying that Google is actually doing it, but it is scary someone has the capability to do it and to know more about you than the government and your mother do. It is important a significant portion of the website and our browsing activities are outside of Google's networks.