There is a simpe easy Trick to Hack Facebook Chat History. We can Hack Chat History even if our Friends are Offline. To use this Trick follow the simple steps given below :
1) Open Friends profile.
2) Right Click on the Poke and Select Copy Link Location. Now we have the ID in our Clipboard.
3) This will exactly look like : http://www.facebook.com/profile.php?id=XYZ
( where XYX can be any numbers and this XYZ is nothing but the ID ).
5) Now it is done.
6) You can see full Chat History now. So this is a simple Trick to Hack Facebook Chat History.