Can I wiped stolen iPhone still show up on Find my Phone?

I had my iPhone stolen, I have been attempting to keep track of it via find my phone app. But all it shows is that it is offline. It's been a while and I have been told that the phone has most likely been wiped. I figured that if a phone is wiped it would go away from my personal find my phone. Is this true? Or does it stay on my account until I remove it.
Also if my phone was wiped/jailbroken is my data safe? Or does jailbreaking it allow them to see all my data. (I changed my passwords soon after theft)

Depends, the new iOS7 only allows you to erase the phone after the Apple ID password has been inputed afterwards, otherwise it stays there. This isn't the case for anything below iOS7 where a thief can just wipe the phone and it's gone.