Many are worried for the fate and future of privacy, and rightly so. It is impossible to get anything done these days without leaving telltale digital trails, which eager spies scoop up. And it turns out you don’t have to divulge much for companies to learn a lot about you. Our digital monitors are busy figuring out how to plumb our intimate depths on the basis of seemingly innocuous and mundane details – details that we hardly give a thought to. What’s more, some companies, like Facebook, aim to compile profiles of you even if you are a relative troglodyte, and engage in little or no digital commerce at all. If you do all you can and should to protect your privacy, even making the ultimate sacrifice of foregoing digital communications altogether, this may not be enough. Facebook will simply learn about you from your neighbors, friends, and family, who invoke you, or imply your existence.