A quote from their blog site: From Yahoo!'s point of view, any type of signed-in individual involving with Yahoo! services is a valued individual, whether she verifies utilizing a Yahoo!, Facebook, or Google ID.
How To Login Yahoo With Facebook
Login to Yahoo Mail account on PC/Desktop computer
First you require a username as well as password; now open web browser from your computer/desktop. Then open web page www.yahoomail.com on it. To launch their new "one-click" sign-in simply click on the "Sign in with: Facebook" icon on the Yahoo! login display. That's all you need; to obtain gain access to of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer
If you are a customer of Mac computer then Safari have to be your web browser. Safari is the very best browsing remedy for Mac OS; Safari fasts, much faster and easy to use browser. You can quickly access your Yahoo Mail account with it. See, how you can login with Yahoo mail account on Safari web browser. Just open Safari and also type www.yahoomail.com; you will be directed to Yahoo mail sign-in page. To start their brand-new "one-click" sign-in merely click on the "Sign in with: Facebook". You are then fully authorized right into Yahoo!
However, an advice- you still will not have the ability to authorize into a mobile or desktop customer making use of Google OpenID.
I hope this post can help you. Thank you ...