You might want have a look at the version 7.3 beta

Support for Asp.Net Identity including support for oAuth. This allows you to authenticate Umbraco users using oAuth providers like Facebook, Google, or your own provider. And if you use a custom membership

7.3.0-beta-released

Have a look at Jan's post

Also trying to get this running from what I can see

First Install Umbraco 7.3 then install the facebook identity extension

Install-Package UmbracoCms.IdentityExtensions.Facebook

that will add some files to the app_start folder

One of those files is the UmbracoCustomOwinStartup there add the line

app.ConfigureBackOfficeFacebookAuth("your facebook app id", "your facebook app secret");

if you don't have an app yet create one with https://developers.facebook.com/

Then update the web.config to use the custom owin startup class so in web.config the owin:appStartup key should be the following

 <add key="owin:appStartup" value="UmbracoCustomOwinStartup" />

now if you go the your profile in the umbraco backoffice you should see a facebook link to link your account

Now you should see the following

But linking isn't working yet for me...

Hi Tim,

Got this working with the beta version of 7.3... you will also need to set the callback path from within UmbracoFacebookAuthExtensions.cs

public static void ConfigureBackOfficeFacebookAuth(this IAppBuilder app, string appId, string appSecret,
        string caption = "Facebook", string style = "btn-facebook", string icon = "fa-facebook")
    {
        var fbOptions = new FacebookAuthenticationOptions
        {
            AppId = appId,
            AppSecret = appSecret,
            //In order to allow using different facebook providers on the front-end vs the back office,
            // these settings are very important to make them distinguished from one another.
            SignInAsAuthenticationType = Constants.Security.BackOfficeExternalAuthenticationType,
            //  By default this is '/signin-facebook', you will need to change that default value in your
            //  Facebook developer settings for your app in the Advanced settings under "Client OAuth Login"
            //  in the "Valid OAuth redirect URIs", specify the full URL, for example: http://mysite.com/umbraco-facebook-signin
            CallbackPath = new PathString("/umbraco-facebook-signin")
        };
        fbOptions.ForUmbracoBackOffice(style, icon);
        fbOptions.Caption = caption;
        app.UseFacebookAuthentication(fbOptions);
    }

Make sure you add this to the Client OAuth Settings on your Facebook app.

Very useful info everyone but I'm actually looking for a way to Register/Login Members using Facebook on the frontend of the website.

Sorry for the mixup, I should have pointed it out more clearly in my question :)

great thanks @thomas :)

@TOm maybe this thread is still usefull https://our.umbraco.org/forum/developers/api-questions/23530-Facebook-and-Umbraco-membership-provider-integration

Hmm still not working, added the following to my google app

that should be all that was missing right @Thomas

is working on a reply...