Google knows more about you than your relatives.
The power in Google data is that people tell the giant search engine things they might not tell anyone else. Google was invented so that people could learn about the world, not so researchers could learn about people, but it turns out the trails we leave as we seek knowledge on the internet are tremendously revealing.
In the Guardian-article, Seth Stephens-Davidowitz reports on his research of Google search queries. He is a data scientist and had the opportunity to analyze anonymized Google search queries.
Everybody lies … except to Google!