A quote from their blog: From Yahoo!'s point of view, any kind of signed-in individual involving with Yahoo! solutions is a valued customer, whether she verifies utilizing a Yahoo!, Facebook, or Google ID.
Login Yahoo with Facebook
Login to Yahoo Mail account on PC/Desktop computer system
First you need a username and also password; now open web browser from your computer/desktop. Then open web 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 display. That's all you need; to obtain access of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer system
If you are a customer of Mac computer system then Safari must be your web browser. Safari is the best surfing remedy for Mac OS; Safari is quick, quicker as well as easy to use internet browser. You could easily access your Yahoo Mail account with it. See, how you can login with Yahoo mail account on Safari browser. Merely open Safari and type www.yahoomail.com; you will certainly be directed to Yahoo mail sign-in web page. To launch their new "one-click" sign-in merely click the "Sign in with: Facebook". You are after that fully authorized into Yahoo!
However, an advice- you still will not have the ability to authorize right into a mobile or desktop computer customer utilizing Google OpenID.
I wish this article could aid you. Thanks ...