This method work with Notification that you receive in your email for example if someone comment your status or send you a message on facebook of course you will receive the notification in your email !
so you are A and your victim is B when your victim comment on your thread in facebook in the system of facebook it will say A <===========> B
so where to find your victim ip it's simple just go to your email and to the notification and view the source of the message type ctrl+f then search this:
X-Facebook: from zuckmail
you wil find a code like this ([MTI3LjAuMC4x]) it's coded in base 64 you have to decode to ascii text then you will find the ip of your target Enj0y!
Tool to decode and encode =========>>> CLICK HERE
for more information check the first line x-store-info:
it has all ;)