Since December, the single sign-on button has supported all three account types. In that sense, the blue button just offers a fuller picture of what Google’s identity platform now encompasses.

A more generic social sign-in Google button has been appearing in some developer accounts, according to The Verge. But a Google spokesperson says it's much ado about nothing.

The writing sure seems to be on the wall for Google+. A few days after Google+ boss Vic Gundotra suddenly announced his departure from the company, Google has begun testing a new sign-in button ...

You’ve probably seen it on lots of apps and websites: buttons urging you to sign in with your Google or Facebook account. Sometimes it’s to let you share files, photos or emails. Other times ...