I cleared all my browser data and visited http://stackoverflow.com and it logged me back in. How?
This happens on Chrome on OS X and Windows 7.
Surely the security concerns outweigh the benefits to the user. What if a family member or friend wants to use my machine? I wouldn't want them logged in as me.
My mistake, I should have said data — all those checkboxes clicked/checked. I completely cleared everything, yet it still logs me back in.
Here's a video to prove it: flickr.com/photos/therobyouknow/7749178118/in/photostream