A quote from their blog site: From Yahoo!'s perspective, any kind of signed-in user engaging with Yahoo! services is a valued user, whether she validates making use of a Yahoo!, Facebook, or Google ID.
Sign Into Yahoo Through Facebook
Login to Yahoo Mail account on PC/Desktop computer
First you require a username and password; currently open web browser from your computer/desktop. After that open web page www.yahoomail.com on it. To start their new "one-click" sign-in just click on 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
If you are an individual of Mac computer after that Safari need to be your web browser. Safari is the most effective surfing remedy for Mac OS; Safari is quick, much faster and also easy to use web browser. You can conveniently access your Yahoo Mail account with it. See, the best ways to login with Yahoo mail account on Safari internet browser. Simply open Safari as well as type www.yahoomail.com; you will be routed 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 fully signed right into Yahoo!
However, an advice- you still won't have the ability to sign right into a mobile or desktop client using Google OpenID.
I hope this post can help you. Thank you ...