If you’re reading this story on Vox.com, we have probably already collected quite a few bits of information about you. We, as well as our third-party advertisers, likely know which type of device you’re on, what browser you’re using, what you do on our site (which articles you read, how long you stay, what ads you visit), and what site you visit next when you click somewhere else. We know where you are based on your device’s IP address — a unique identifier assigned to each device connected to the internet — but don’t use GPS to actively track your location.