A quote from their blog: From Yahoo!'s point of view, any kind of signed-in user involving with Yahoo! solutions is a valued customer, whether she confirms making use of a Yahoo!, Facebook, or Google ID.
Login To Yahoo With Facebook
Login to Yahoo Mail account on PC/Desktop computer system
First you require a username as well as password; now open web browser from your computer/desktop. After that open page www.yahoomail.com on it. To start their brand-new "one-click" sign-in simply click the "Sign in with: Facebook" icon on the Yahoo! login display. That's all you require; to obtain accessibility of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer
If you are a customer of Mac computer system then Safari must be your web browser. Safari is the most effective browsing service for Mac OS; Safari fasts, much faster as well as easy to use web browser. You can easily access your Yahoo Mail account with it. See, how you can login with Yahoo mail account on Safari web browser. Merely open Safari and type www.yahoomail.com; you will certainly be directed to Yahoo mail sign-in web page. To start their new "one-click" sign-in just click the "Sign in with: Facebook". You are then fully signed right into Yahoo!
Nonetheless, a suggestion- you still will not have the ability to authorize right into a mobile or desktop customer making use of Google OpenID.
I hope this write-up could aid you. Thanks ...