> IP This is a surprisingly effective one when combined with other users of your network. A couple of years ago, I started getting Facebook ads for things I'd

> IP This is a surprisingly effective one when combined with other users of your network. A couple of years ago, I started getting Facebook ads for things I'd never looked at, but that I knew my wife had looked at. We don't share any devices, and she doesn't even have a Facebook account. It's pretty troubling how invasive shadow profiles are.