How to hack a twitter account?

[Twilightly]

I know this sounds weird, but my high school sorority has a twitter, facebook, and instagram page. I am now in charge of these things, but I have missed placed the passwords and no one has a clue which email was used to set up the accounts. (I did not set up any of them, they were pre-made then handed off to me.) Is their another way to recover passwords? Is it even possible that I can hack into them and change the passwords? I have facebook logged in on my computer, but I don't know the password and need to change it. The others I have never logged into.
No one else knows the passwords somehow not even the person who was in charge of the accounts b4 me.
Help ASAP please.
Thanks in advance.

[GhostLeader]

hacking any type of account will get you arrested for computer crimes i don't recomend but theres another way your dumb but thats ok if you forgot you password go to facebook...mail bla what ever you need and go to ''did you forget your password'' and they will send your password to your phone if that dosen't work then your screwed