sentences:  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.