So far I've started using Super User, Stack Overflow, Ask Ubuntu and Photography on the Stack Exchange network. Every time I log into one of them (with Google ID) and go to another one of these four sites, I automatically get a message on the top of the page saying I'm already logged in so all I need is to refresh the page and that's it. However, when I want to log out it's a whole different story. I have to enter each site and log out separately. Nothing seems to do it; I've tried going to stackexchange.com but logging out from there only logs me out of -you guessed it- stackexchange.com. Is there a way to do it?