Knowledge Base Frequently Asked Questions Facebook How do I enable U2F login in Facebook on my computer? How can I use a YubiKey NEO to log into my Facebook account in Android? How can I use my YubiKey to log into Facebook on my iOS device? When I log in to Facebook, why am I not prompted to use my Security Key or YubiKey every time? What happens when I want to log in from an unsupported browser (such as Internet Explorer, Edge, or Safari)? Why are Security Keys more secure than the current SMS method I am using with Facebook?