A quote from their blog: From Yahoo!'s point of view, any signed-in individual engaging with Yahoo! services is a valued individual, whether she validates utilizing a Yahoo!, Facebook, or Google ID.
Login To Yahoo Mail Through Facebook
Login to Yahoo Mail account on PC/Desktop computer system
First you need a username and also password; now open web browser from your computer/desktop. Then open 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 screen. That's all you need; to get accessibility of your Yahoo mail account.
Login to Yahoo Mail account on Mac computer system
If you are a user of Mac computer system then Safari should be your web browser. Safari is the best browsing solution for Mac OS; Safari fasts, quicker as well as easy to use internet browser. You can easily access your Yahoo Mail account with it. See, the best ways to login with Yahoo mail account on Safari internet browser. Merely open Safari and kind www.yahoomail.com; you will be guided to Yahoo mail sign-in web page. To launch their new "one-click" sign-in simply click the "Sign in with: Facebook". You are after that completely authorized into Yahoo!
Nonetheless, an advice- you still will not be able to sign into a mobile or desktop computer customer making use of Google OpenID.
I wish this article can help you. Thank you ...