See the article Google Has Quietly Dropped Ban on Personally Identifiable Web Tracking, by Julia Angwin. Apparently, Google no longer takes Internet users’ privacy seriously.
. . . 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.
To opt-out of Google’s identified tracking, visit the Activity controls on Google’s My Account page, and uncheck the box next to “Include Chrome browsing history and activity from websites and apps that use Google services.” You can also delete past activity from your account.
There is an old story about two guys standing in the front room of a house, looking out the window at the street. Suddenly, police cars and SWAT vans race up, their lights flashing, and cops rush out and point guns at the window. Bullets begin to fly, and the glass shatters. One guy drops to the floor and puts his hands over his head. The other guy just stands there and watches. The guy on the floor shouts, “Get down, you idiot!” The one standing up says, “Why? I haven’t done anything wrong.”