That company has admitted it tracks the online behavior of people who never intentionally engage with it at all, thanks to partnerships with other websites. (fivethirtyeight.com)
This tool can be beneficial in giving you some first ideas about the search behavior of people in the area you want to write about. (yoast.com)
Specifically, the studies don't observe real life, they take a snapshot of behaviors of people choosing between a gift card and cash for a food purchase. (money.stackexchange.com)