Google+

Google+ is a popular social network created by Google. It is currently the second most popular social network, next to Facebook. Google+ has many features that it allows for developers to take advantage of, such as Google+ sign-in, Hangout apps, and Google+ plugins.

Google+ sign-in
Google+ sign-in is a service that you can integrate into different applications. It allows the user to sign into your app with Google+, which has many benefits. A tutorial on Google+ sign-in can be found at Tutorial:Google+/Sign-in.