A quote from their blog: From Yahoo!'s viewpoint, any kind of signed-in user involving with Yahoo! services is a valued customer, whether she validates making use of a Yahoo!, Facebook, or Google ID.
Facebook Yahoo Sign In
Login to Yahoo Mail account on PC/Desktop computer system
First you require a username and password; now open internet internet browser from your computer/desktop. After that open web page www.yahoomail.com on it. To start 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 get access of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer
If you are a customer of Mac computer then Safari need to be your web internet browser. Safari is the best browsing service for Mac OS; Safari fasts, quicker and easy to use web browser. You can quickly access your Yahoo Mail account with it. See, ways to login with Yahoo mail account on Safari web browser. Just open Safari as well as type www.yahoomail.com; you will be guided to Yahoo mail sign-in page. To start their new "one-click" sign-in merely click on the "Sign in with: Facebook". You are then totally authorized right into Yahoo!
Nevertheless, a suggestion- you still won't have the ability to authorize into a mobile or desktop computer client utilizing Google OpenID.
I hope this short article can assist you. Thanks ...