Google is making it easier for app developers to connect with users on its social network through Google+ Sign-In, a new feature that allows people to sign into third-party apps using their Google+ credentials. The authentication system lets Google+ users sign into outside apps with their existing user name and password, and includes Google's two-step security verification when logging in from a mobile phone. The user's Google+ info is automatically pulled into the app with the tool, which is available to Android, iOS and Web application developers.