With respect I suspect the author of that article has blown this somewhat out of proportion. Here are links to the updated Google Privacy policy and terms of service:
http://googleblog.blogspot.com/2012/01/updating-our-privacy-policies-and-terms.html
Preview: Privacy Policy ? Policies & Principles
Google Terms of Service ? Policies & Principles
Their privacy policy seems to indicate that when a subscriber has multiple Google services that Google will combine the information received from each of these services to better support the subscribers needs. In other words if you use Android, GMail, Calendar, and Google+, your personal information entered into Google+ will be accessible to each of the other services. If your Android phone has GPS enabled and Google location services checked, Google will use your GPS location in conjunction with Calendar to let you know if you are going to be late for a scheduled meeting. If you don't have Google location services enabled on your phone then Google will not provide you notification that you're gonna be late for that meeting.
If you ask Google to not share your personal information with anyone outside of Google then they won't (except under the following circumstances:
* meet any applicable law, regulation, legal process or enforceable governmental request.
* enforce applicable Terms of Service, including investigation of potential violations.
* detect, prevent, or otherwise address fraud, security or technical issues.
* protect against harm to the rights, property or safety of Google, our users or the public as required or permitted by law).
With respect to DoubleClick, the following was taken directly from their Privacy Policy document:
Google said:
We will not combine DoubleClick cookie information with personally identifiable information unless we have your opt-in consent.