Stolen iPhone and FB question?

[Alen]

If what you sent is the facebook message, I am afraid it may not be shown on the lock screen after you change its pass. If you have set up Find My iPhone on your device prior to it getting lost or stolen, you can go to https://www.icloud.com/ in your web browser to track where your device is. When you log in, Find My iPhone will immediately begin trying to locate your device if it is online. You can also enable Lost Mode in iCloud to force the thief call you back.
To protect your new idevice in the future, I suggest you set up Find My iPhone/iPad/iPod in iCloud on the device and apply some free anti-theft apps like iLostFinder. It will take pics of the thief or finder when she/he tries to open your device and then send the pics to your email.
Hope it helps.

http://ilostfinder.com/