Being realistic, this is not far from what they were already doing: Google already tracked your searches, what you are watching on Youtube or your emails.
But before March, 1st, Google Plus, Youtube, Gmail and almost 60 Google products, were in different databases. With this change, Google guys are giving themselves the right to put all those products in just one big place, put one and one and one together to build a better and more complete online behaviour of YOU. And use it to chase YOU with their ads.
It should be nonsense for me to tell you to stop using Google products. Almost everything you do in the internet today, from searches and emails, to finding a street and comparing products’ prices, is somehow through a Google product or related to it.
But you can at least reduce the amount of information that Google will be able to collect from you.
You can, for instance, delete your Google history going to https://www.google.com/history/ and clicking the button “Remove all Web History”
You can also configure your advertising settings here: https://www.google.com/settings/u/0/ads/preferences/
You can edit your settings or even opt out.
Another way to “confuse” Google is creating a different account for each Google service (if you can keep up with all usernames and passwords).
Or, when watching a video on Youtube or searching the Web, make sure you are not logged in to your Google account.
There is also the possibility to use browser plugins that work to protect your data, or even anonymous proxies.
But, the truth is, as soon as you type into your computer, click anything, visit at a page, talk through Skype, or even talk on a telephone, (mobile or fixed), those who want to, can spy on you.
At least now Google is coming clear and telling you that they are spying on you. It makes better sense to me than living in a fool’s paradise, where you still believe that you have control over your life.