[fsajkdnjk]

assuming no smartphone in this scenario, every time you visit any o their services you are being tracked via ip and headers you sent(referrer for example). this way they can build a profile, even if they do not have your personal details. you think you are "safe" if you do not use their services but 99% of websites use their google analytics, cdn or social widgets/sharing buttons... which allows them to track you. so the only way to avoid this breach of privacy is to keep your hosts file updated and never let your browser access any of their websites. i would also be concerned with their dns over http now.

facebook is the same but due to its nature it does it only via its social sharing widgets that people put on their websites and the embedded comments and things like that.

google's cdn is the most dangerous of these things.