Ina Fried, Axios:
Facebook’s privacy policies reinforce the message that “you have control over who sees what you share on Facebook.” But if you use Facebook at all, you don’t have much control over what Facebook itself sees about you.
I love stuff like this because it puts into plain terms the dizzying scope of Facebook’s entrenchment. The vast majority of the information Facebook collects seems specific to users, but plenty of data points on non-users are also collected without their consent.
Now do Google.