If you know what college they go to. Find someone else that goes to that college and then you can look at your friend's profile. That is the only way I can think of.
facebook password and email password can be totally different..you still have your email password giving you the authority to change the password to your facebook anytime u want
there is more to life than facebook and myspace. like actually talking to someone. and if you are wondering about how many dudes your ex hooked up with, it is probably more than you want to know.