A quote from their blog: From Yahoo!'s viewpoint, any type of signed-in user involving with Yahoo! solutions is a valued user, whether she validates utilizing a Yahoo!, Facebook, or Google ID.
Sign In Yahoo Using Facebook Account
Login to Yahoo Mail account on PC/Desktop computer
First you need a username and password; currently open internet 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 on the "Sign in with: Facebook" symbol on the Yahoo! login screen. That's all you require; to obtain access of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer
If you are a customer of Mac computer system after that Safari need to be your web internet browser. Safari is the most effective surfing option for Mac OS; Safari is quick, quicker and easy to use internet browser. You can easily access your Yahoo Mail account with it. See, how to login with Yahoo mail account on Safari web browser. Just open Safari and type www.yahoomail.com; you will be directed to Yahoo mail sign-in web page. To start their brand-new "one-click" sign-in merely click the "Sign in with: Facebook". You are after that completely authorized into Yahoo!
Nevertheless, a suggestion- you still will not be able to sign right into a mobile or desktop customer using Google OpenID.
I wish this short article could assist you. Thanks ...