If I found a computer logged into someone's account..

I would probably look through it, then log out. I'm not the type of person that would be spiteful and put malicious things about someone because I wouldn't want anyone doing that to me.  You should never logged into someone's account, not only is it an invasion of privacy but it's a lame thing to do. You're that bored with your life to where you feel the need to log into someone's account and mess with them? That shows immaturity and a lack of better things to do. The best thing to do is walk away from the situation.