We now have broad and secure authentication. We can check against Facebook and Google, which can account for 100 percent of the users. In addition to this, we can allow users to register and login locally, storing their passwords securely. Because we used Passport, we have access to hundreds of other authentication providers. The Passport site lists them out if you are curious.
In the next chapter, we are going to look at adding message queues to our application using RabbitMQ.