I think the log-in system can be improved. I am always logged in on facebook, but I use another facebook account for superuser, stackoverflow, etc.
When I want to log in, it is impossible to log in on the right account! I admit this is a pretty specific situation, but there may be more people experiencing this problem. My solution, for now, is to go to incognito mode, where I'm not logged in to facebook.
Could this perhaps be changed to a system where you choose to login with a different facebook account? Or is this simply impossible because you can only be logged in to facebook with one account at a time?