A few days ago Google announced a new privacy policy: If you're signed into any Google service, the information that Google collects from you can be combined with information from every other Google service to build a gigantic profile of your activities and preferences. On Tuesday I wrote that I was pretty unhappy about this, and a lot of people wanted to know why. After all, Google says this new policy will mean a better computing experience for everyone:

"Our recently launched personal search feature is a good example of the cool things Google can do when we combine information across products. Our search box now gives you great answers not just from the web, but your personal stuff too…But there's so much more that Google can do to help you by sharing more of your information with…well, you. We can make search better—figuring out what you really mean when you type in Apple, Jaguar or Pink. We can provide more relevant ads too. For example, it's January, but maybe you're not a gym person, so fitness ads aren't that useful to you. We can provide reminders that you're going to be late for a meeting based on your location, your calendar and an understanding of what the traffic is like that day."

So what's my problem? Easy. In that mass of good news, the real reason for Google's announcement was stuffed quietly into the middle: "We can provide more relevant ads too."