I'm still able to log in to Yahoo! with my Google account, although it seems they're phasing out that option: http://money.cnn.com/2014/03/05/technology/yahoo-g

I'm still able to log in to Yahoo! with my Google account, although it seems they're phasing out that option: http://money.cnn.com/2014/03/05/technology/yahoo-google-facebook-login/index.html http://money.cnn.com/2014/03/05/technology/yahoo-google-face...