I again registered a test account for 'Log in with Stack Exchange'.
Disappointingly, after logging out of every (SE family) site, it still lets me log in again merely by button clicks, while I type nothing.
After more than a year, clearly the managers of the Stack Exchange network family of websites don't give a hoot about protecting users of shared computers with a truly effective signout.
What if some rude person at a party click-logged into and deleted someone's account, thus trashing their vast accumulation of reputation?
Copyright (c) 2013 Mark D. Blackwell.