A quote from their blog site: From Yahoo!'s perspective, any signed-in customer involving with Yahoo! solutions is a valued customer, whether she authenticates using a Yahoo!, Facebook, or Google ID.
Login to Yahoo with Facebook
Login to Yahoo Mail account on PC/Desktop computer
First you need a username and password; now open web browser from your computer/desktop. Then open web page www.yahoomail.com on it. To launch their brand-new "one-click" sign-in just click on the "Sign in with: Facebook" icon on the Yahoo! login display. That's all you need; to get accessibility of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer system
If you are a customer of Mac computer then Safari should be your internet browser. Safari is the best browsing service for Mac OS; Safari is quick, much faster and easy to use web browser. You could easily access your Yahoo Mail account with it. See, ways to login with Yahoo mail account on Safari web browser. Simply open Safari and also kind www.yahoomail.com; you will certainly be directed to Yahoo mail sign-in page. To start their brand-new "one-click" sign-in simply click on the "Sign in with: Facebook". You are after that totally authorized into Yahoo!
However, a suggestion- you still will not have the ability to sign right into a mobile or desktop client utilizing Google OpenID.
I hope this post can help you. Thanks ...