So you log into your accounts on a public computer (304 is public because anyone can use the computer). You’re lazy, so you switch to private browsing so that you can sign out by just closing the browser. And you forgot to close the browser. And you have Revenge of the Sith friends.
*drumroll*
I’VE BEEN PWNED!

Yeah, Open Source!
Same with my plurk, but I’m kinda used with it getting pwned on a regular basis.
Anyway, moral of the story:
Yeah, you may be lazy in signing out your accounts and you’re bright enough to use private browsing but please, closing the browser is just a click away. Or you can just unplug the power cord. Or better yet, choose better friends. XD