WARNING TO ALL STEAM USERS. DO NOT ATTEMPT TO LOG IN OR OUT
Valve seemed to have screwed up ROYALLY. In mass along with many of my personal friends have reported being logged into OTHER people's accounts! The SAFEST thing you can do is DO NOT TOUCH ANYTHING. Don't touch steam right now AT ALL. MAKE SURE TO UNLINK YOUR CARDS/PAYPAL whatever you use that has valuable information on it!
ONCE AGAIN, DO NOT TOUCH ANYTHING until it's resolved. As of now there is no real answer to what caused this, but I figured I'd warn all of you, assuming a lot of you have steam accounts you value greatly.
Update, steam store is shutdown to avoid any false purchases.