Facebook authentication with Kinvey.

gistfile1.js

// Initialize the Facebook SDK.
FB.init({
  appId: '<your-app-id>',
  oauth: true
  /* additional properties */
});

// Open login popup.
FB.login(function(response) {
  if(response.authResponse) {
    // Login user at Kinvey.
    new Kinvey.User().loginWithFacebook(response.authResponse.accessToken, {
      success: function(user) {
        // User is now both a Facebook and Kinvey user.
        console.log(user.getIdentity());// Logs Facebook identity.
      },
      error: function() {
        // An error occurred.
      }
    });
  }
  else {
    // User cancelled login or did not fully authorize.
  }
});