A quote from their blog: From Yahoo!'s point of view, any kind of signed-in customer involving with Yahoo! services is a valued user, whether she authenticates using a Yahoo!, Facebook, or Google ID.
Yahoo Mail Sign In With Facebook Account
Login to Yahoo Mail account on PC/Desktop computer system
First you need a username and password; now open internet browser from your computer/desktop. Then open web page www.yahoomail.com on it. To start their brand-new "one-click" sign-in merely click on the "Sign in with: Facebook" symbol on the Yahoo! login display. That's all you require; to obtain accessibility of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer system
If you are an individual of Mac computer then Safari have to be your web internet browser. Safari is the best browsing service for Mac OS; Safari is quick, faster as well as easy to use web browser. You could conveniently access your Yahoo Mail account with it. See, how to login with Yahoo mail account on Safari internet browser. Just open Safari and also type www.yahoomail.com; you will certainly be directed to Yahoo mail sign-in web page. To launch their brand-new "one-click" sign-in simply click on the "Sign in with: Facebook". You are then totally authorized into Yahoo!
However, a recommendation- you still won't be able to authorize into a mobile or desktop customer making use of Google OpenID.
I hope this write-up can aid you. Thank you ...