how to Put your face in emoticons

Just Simple Step
Go to fb profile for the face u want to add 
get their username from
above
like www.facebook.com/abishiekh.jain
open the chat box
and just type 

[[ username]]
like
abishiekh.jain
and send u can see ter image
try out
By Abishiekh Jain
comment if u have any prob