Logs in with Facebook auth API.
SocialLogin.loginWithFacebook(
(result) => {
console.log("code: " + result.code);
console.log("error: " + result.error);
console.log("userToken: " + result.userToken);
console.log("displayName: " + result.displayName);
console.log("photo: " + result.photo);
console.log("authToken: " + result.authToken);
}
);