content: So lets say that I browse Facebook and Youtube with a browser that has an privacy-addon. I close the browser, turn on a VPN and start browsing Nissan cars or something random. Since I'm using the same browser / computer, how likely would it be for Facebook and Google to know that I'm the same person?  EDIT: Does it even make any difference at all if I'm browsing Facebook / Youtube at the same time I'm visiting the Nissan site?