Facebook has introduced new security measures to logging in that allow account holders to use a physical key to access their social network profile. On Thursday, the social media giant said it would let users link a hardware token to their accounts. When you log in from new browsers or geographic regions, you can plug the piece of hardware into your USB drive and give it a tap. One of the largest sellers of consumer security keys is Yubico, which boasts that its products—called Yubikeys—are "unphishable."
