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Google's March 1, 2012 privacy change enables the company to share data across a wide variety of services. This includes embedded services in millions of third-party websites using Adsense and Analytics. The policy was widely criticized as creating an environment that discourages Internet innovation by making Internet users more fearful online.

In December 2009, after privacy concerns were raised, Google's CEO Eric Schmidt declared: "If you have something that you don't want anyone to know, maybe you shouldn't be doing it in the first place. If you really need that kind of privacy, the reality is that search engines—including Google—do retain this information for some time and it's important, for example, that we are all subject in the United States to the Patriot Act and it is possible that all that information could be made available to the authorities."

Privacy International has raised concerns regarding the dangers and privacy implications of having a centrally located, widely popular data warehouse of millions of Internet users' searches, and how under controversial existing U.S. law, Google can be forced to hand over all such information to the U.S. government. In its 2007 Consultation Report, Privacy International ranked Google as "Hostile to Privacy", its lowest rating on their report, making Google the only company in the list to receive that ranking.

At the Techonomy conference in 2010, Eric Schmidt predicted that "true transparency and no anonymity" is the way forward for the internet: "In a world of asynchronous threats it is too dangerous for there not to be some way to identify you. We need a [verified] name service for people. Governments will demand it." He also said that "If I look at enough of your messaging and your location, and use artificial intelligence, we can predict where you are going to go. Show us 14 photos of yourself and we can identify who you are. You think you don't have 14 photos of yourself on the internet? You've got Facebook photos!"

In the summer of 2016, Google quietly dropped its ban on personally-identifiable info in its DoubleClick ad service. Google's privacy policy was changed to state it "may" combine web-browsing records obtained through DoubleClick with what the company learns from the use of other Google services. While new users were automatically opted-in, existing users were asked if they wanted to opt-in, and it remains possible to opt-out by going to the Activity controls in the My Account page of a Google account. ProPublica states that "The practical result of the change is that the DoubleClick ads that follow people around on the web may now be customized to them based on your name and other information Google knows about you. It also means that Google could now, if it wished to, build a complete portrait of a user by name, based on everything they write in email, every website they visit and the searches they conduct." Google contacted ProPublica to correct the fact that it doesn't "currently" use Gmail keywords to target web ads.

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