Google/Facebook and others know how long you look at a specific post/ad/video/etc and knows who you're with, even when in a private residence. If you're in som

Google/Facebook and others know how long you look at a specific post/ad/video/etc and knows who you're with, even when in a private residence. If you're in someone's house on their wifi network and they're shopping for socks... you might start seeing ads about socks. It's way easier to track this based on network information than creating facial recognition databases. A lot of the "Facebook is listening to your conversation" fears stem from the fact that people don't realize that they can use data to make connections like this. If you're remotely concerned about privacy, at the very least Facebook should not have an app on your phone (Google's doing it too).