Why aren't we password free yet?
qnoid.com
qnoid.com
I'm Markos Charatzas, the author of the post.
This is actually a series of posts written (http://qnoid.com/2012/11/10/A-post-about-user-identity-that-..., http://qnoid.com/2012/11/10/Mockups-on-user-identity.html, http://www.youtube.com/watch?v=_9Zu-AHhXyo), talks given (https://speakerdeck.com/qnoid/user-identity-nsconference-201... https://speakerdeck.com/qnoid/user-identity) and open source code released (https://github.com/verylargebox/VLBUserIdentity) on how we should think of user authentication based on existing user behaviour (never signing out) and trends (long lived sessions, email verification).
When talking about mobile, people don't log out of every app before locking their device.
If you have any further questions after reading all the above happy to address them.
2. People use different computer.
3. People who likes to sign off.
4. People who likes to use private browsing.
5. People who create new profile.
If you are Facebook, try that. Passwordless will not scale. Of course, passwordless scheme only works for very limited, selected websites.