Tuesday, February 26, 2013 | 8:01 AMToday we’re adding a new feature to the Google+ platform: application sign-in. Whether you’re building an app for Android, iOS or the web, users can now sign in to your app with Google, and bring along their Google+ info for an upgraded experience. It’s simple, it’s secure, and it prohibits social spam. Simplicity and security come firstIf you sign in to Gmail, YouTube or any other Google service, you can now use your existing credentials to sign in to apps outside of Google. Google+ Sign-In also comes with the protections and safeguards you’ve come to expect from your Google account (like 2-step verification), so you can always sign in with confidence.