Stolen Iphone, what to do with accounts on there like Email?

So my iPhone was stolen today (had a pass code) but if they did get into the phone is there a way I can stop them from getting into my Hotmail as I use my Hotmail on my mobile as well as Facebook, but I took my number of Facebook and stopped active sessions on there.

You could change your email or Facebook password so the can't log in

Go into all your accounts and change the passwords to some difficult to figure out new ones. Then they can't use your accounts. Call your carrier and have them cut service to the phone too.

Go into your iTunes account, and use the app in there to disable your iPhone and/or erase it. If you set your iPhone up right you can even trace where it is with "Find My iPhone" on your computer.