Facebook login - automatic login if the user already authorized the app

Currently in my app the user is required to login manually every time the app opens. 

On IPhone, this causes the “already authorized” dialog to show. 

What is the best way to automatically login if the user already authorized the app? 

I don’t want the user to press login every time the app opens, but only the first time. 

I saw this tutorial which shows how to do it with parse:

http://www.develephant.net/managing-facebook-users-with-the-corona-sdk-parse-module/

isn’t there an easier way to do this, without having to manage a user’s table in parse?

Is there a way to check if the user is already logged in?

Thanks!