How to find someone's chat history Facebook source code ??

How to find someone's chat history Facebook source code ??

1) Login to your facebook profile.
2) Now go to "http://www.facebook.com/" Or alternatively you can click on "home" button.
3) Right-click on any blank part of page and select "view page source" or alternatively open "view-source:https://www.facebook.com/" in a new tab of your browser.
4) Now search for "InitialChatFriendsList" in source code.

5) Right after this keyword you'll see the following:

{"list""100303443483","100027126747","1000150182784",

"1000316478180","1000012130967","1000024602374",",]:}

These numbers are the Facebook ID's of your friends profile; the first number is the facebook friend's profile ID,with whom you mainly chat.

6) To see who is the specific person exist behind a Facebook ID. just copy any Facebook ID and, replace the X's with copied Facebook ID and open it in your browser.

http://www.facebook.com/XXXXXXXXXX