Today Google+ has released a sign-in option for their social network service. Developers are responsible for integrating Google+ into their services if they want to set it up. Currently the applications that use Google+ Sign-In include OpenTable, Flixster, Shazam, and OpenTable. Many other companies are in the process of integrating Google+ into their services. The company did not launch the service right away so that they could avoid a rush of “social spam” like what happened to Facebook. After you log in to services through Google+, you can manage the settings from this page.