> what do we know for sure Google know and track about us?
For start, your entire search history. After you search, Google tracks how much time you spend on those sites with AdSense. Google reads our emails to scan for flights and to add appointments to calendar. It knows the places we go because Google Maps and the videos we watch online.
Google has plenty data to make an accurate profile of you, and you can see it’s inferences on your relationship status, income, employer and so on in your Google account[1]. (IIRC it was more complete some years ago, now it’s showing less categories or there’s another link I can’t find.)
For start, your entire search history. After you search, Google tracks how much time you spend on those sites with AdSense. Google reads our emails to scan for flights and to add appointments to calendar. It knows the places we go because Google Maps and the videos we watch online.
Google has plenty data to make an accurate profile of you, and you can see it’s inferences on your relationship status, income, employer and so on in your Google account[1]. (IIRC it was more complete some years ago, now it’s showing less categories or there’s another link I can’t find.)
[1]: https://support.google.com/My-Ad-Center-Help/answer/12155964...