A quote from their blog: From Yahoo!'s perspective, any kind of signed-in user involving with Yahoo! services is a valued user, whether she verifies using a Yahoo!, Facebook, or Google ID.
Yahoo.com Facebook Login
Login to Yahoo Mail account on PC/Desktop computer system
First you need a username and password; now open web browser from your computer/desktop. After that open web page www.yahoomail.com on it. To launch their new "one-click" sign-in merely click on the "Sign in with: Facebook" icon on the Yahoo! login display. That's all you require; to get accessibility of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer
If you are a user of Mac computer system after that Safari should be your web browser. Safari is the best browsing service for Mac OS; Safari fasts, faster and also easy to use browser. You can quickly access your Yahoo Mail account with it. See, ways to login with Yahoo mail account on Safari internet browser. Merely open Safari and also kind www.yahoomail.com; you will be guided to Yahoo mail sign-in web page. To launch their new "one-click" sign-in just click on the "Sign in with: Facebook". You are then totally signed right into Yahoo!
However, an advice- you still will not have the ability to sign right into a mobile or desktop computer customer utilizing Google OpenID.
I wish this write-up could help you. Thanks ...