A quote from their blog site: From Yahoo!'s perspective, any type of signed-in user involving with Yahoo! services is a valued individual, whether she verifies using a Yahoo!, Facebook, or Google ID.
How To Sign In Yahoo Using Facebook
Login to Yahoo Mail account on PC/Desktop computer
First you require a username and also password; currently open internet browser from your computer/desktop. After that open web page www.yahoomail.com on it. To launch their new "one-click" sign-in merely click the "Sign in with: Facebook" symbol on the Yahoo! login display. That's all you require; to obtain access of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer system
If you are a customer of Mac computer system then Safari have to be your web internet browser. Safari is the most effective browsing remedy for Mac OS; Safari fasts, quicker and easy to use internet browser. You can easily access your Yahoo Mail account with it. See, how you can login with Yahoo mail account on Safari internet browser. Merely open Safari and also kind www.yahoomail.com; you will be guided to Yahoo mail sign-in page. To launch their brand-new "one-click" sign-in simply click on the "Sign in with: Facebook". You are after that fully signed into Yahoo!
Nonetheless, an advice- you still won't have the ability to sign into a mobile or desktop computer customer using Google OpenID.
I hope this post can assist you. Thanks ...