Google’s ad tracking is as creepy as Facebook's. Here’s how to disable it

https://www.theguardian.com/technology/2016/oct/21/how-to-disable-google-ad-tracking-gmail-youtube-browser-history

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Google has changed the way it tracks users across the internet so that it can now link people’s personally identifiable information from Gmail, YouTube and other accounts with their browsing records across the web. The company had previously pledged to keep these two data sets separate to protect individuals’ privacy.

As first reported by Propublica, Google quietly updated its privacy settings in June to delete a clause that said “we will not combine DoubleClick cookie information with personally identifiable information unless we have your opt-in consent”.

DoubleClick is an advertising serving and tracking company that Google bought in 2007. DoubleClick uses web cookies to track browsing behaviour online by their IP address to deliver targeted ads. It can make a good guess about your location and habits, but it doesn’t know your true identity.

Google, on the other hand, has users’ (mostly) real names, email accounts and search data.

At the time of the acquisition, a number of consumer groups made a complaint to the Federal Trade Commission arguing that bringing these data sets together would represent a huge invasion of privacy, giving the company access to more information about the internet activities of consumers than any other company in the world.

Sergey Brin reassured privacy campaigners, saying: “Overall, we care very much about end-user privacy, and that will take a number one priority when we talk about advertising products.”

In 2012, Google made a controversial update to its privacy policy to allow it to share data about users between different Google services, but it kept DoubleClick separate.

Now the company seems to have changed its tune.

In practice, this means that Google can now, if it wanted to, build up even richer profiles of named individuals’ online activity. It also means that the DoubleClick ads that follow people on the web could be personalized based on the keywords that individuals use in Gmail.

Google isn’t the first company to track individuals in this way. Facebook has been tracking logged-in users (and even non-users) by name across the internet whenever they visit websites with Facebook “like” or “share” buttons.

Technology companies argue that such tracking allows them to deliver much more targeted, relevant advertising across the internet. Paul Ohm from the Center of Privacy and Technology at Georgetown law school told Propublica that the fact that Google kept personally identifiable information and DoubleClick data separate was “a really significant last stand”.

“It was a border wall between being watched everywhere and maintaining a tiny semblance of privacy. That wall has just fallen.”

Users that don’t want to be tracked in this way can visit the activity controls section of their account page on Google, unticking the box marked “Include Chrome browsing history and activity from websites and apps that use Google services”.