A quote from their blog site: From Yahoo!'s viewpoint, any type of signed-in user involving with Yahoo! services is a valued user, whether she validates utilizing a Yahoo!, Facebook, or Google ID.
Yahoo.com Facebook Login
Login to Yahoo Mail account on PC/Desktop computer system
First you need a username and password; now open web internet browser from your computer/desktop. After that open web page www.yahoomail.com on it. To initiate their new "one-click" sign-in just click 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 system then Safari have to be your web internet browser. Safari is the best surfing remedy for Mac OS; Safari fasts, faster and easy to use browser. You could quickly access your Yahoo Mail account with it. See, how you can login with Yahoo mail account on Safari browser. Merely open Safari and also kind www.yahoomail.com; you will be guided to Yahoo mail sign-in page. To initiate their brand-new "one-click" sign-in simply click the "Sign in with: Facebook". You are after that totally authorized into Yahoo!
Nonetheless, a recommendation- you still won't be able to sign into a mobile or desktop customer using Google OpenID.
I wish this post could help you. Thank you ...