A quote from their blog site: From Yahoo!'s point of view, any kind of signed-in user involving with Yahoo! services is a valued customer, whether she authenticates making use of a Yahoo!, Facebook, or Google ID.
Sign Into Yahoo With Facebook
Login to Yahoo Mail account on PC/Desktop computer system
First you require a username and also password; currently open web internet browser from your computer/desktop. After that open web page www.yahoomail.com on it. To initiate their brand-new "one-click" sign-in just click on the "Sign in with: Facebook" symbol on the Yahoo! login screen. 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 user of Mac computer then Safari should be your internet browser. Safari is the very best surfing option for Mac OS; Safari is quick, much faster and easy to use browser. You can quickly access your Yahoo Mail account with it. See, the best ways to login with Yahoo mail account on Safari browser. Just open Safari and kind www.yahoomail.com; you will be directed to Yahoo mail sign-in web page. To start their new "one-click" sign-in simply click on the "Sign in with: Facebook". You are then completely signed right into Yahoo!
Nevertheless, a recommendation- you still won't have the ability to sign right into a mobile or desktop client utilizing Google OpenID.
I hope this post could help you. Thank you ...