I am afraid, I would not use it. As others pointed it out, login is such a small part of a system that it's not worth employing a 3rd party service to get it wo

I am afraid, I would not use it. As others pointed it out, login is such a small part of a system that it's not worth employing a 3rd party service to get it working. Also, using this service requires trust. I personally don't use nor implement FB, Google, etc logins either as I don't trust them.