Usually when my PC is on and my browser is on I am always logged into ServerFault, and I don't care much about that, since it is at my home PC.

However, I've been into a friend house yesterday and logged into ServerFault from his PC, but then I've noticed that I can't log out?!

I am using my GMail acc. to log in here, and I tried to log out from GMail, but that didn't help either.

There is no LogOut button, and **the only thing that loged me out was the deletion of the browser cookies.**

**Why there is no logout button on all of stack exchange sites?**