Since you wanted to restrict it to things that happened:
- Chrome began to "log in" users into the browser by default, if they so much as logged in to Gmail or Youtube, or anything that uses Gmail ID oAuth. That means that all the searches and web visits made on the browser are explicitly tied to your Gmail ID.
- Chrome began to "log in" users into the browser by default, if they so much as logged in to Gmail or Youtube, or anything that uses Gmail ID oAuth. That means that all the searches and web visits made on the browser are explicitly tied to your Gmail ID.