Yahoo! has gone partially password-free with the stable release of a second-factor account sign-in tool that uses push messages to identify users. The mechanism first launched in October for Yahoo! Mail allows users to log into other Purple Palace apps including Messenger, Finance, Fantasy, and the Sports app on iOS and Android handsets. Users signing in to Yahoo! properties without a password on their computers will after activating the feature receive a push notification on their registered handsets. Yahoo! has long been on a mission to kill passwords. Last year it began sending one-time passwords using SMS when users attempted to sign in. http://goo.gl/OfxNwa