How To Add More Stickers/Emoticons to Facebook Chat

all know that Facebook added good looking and larger emoticons to chat window which were seen long back in handheld devices. These emoticons/stickers can be added to conversations by clicking on the smiling face that you can see at the bottom of the chat window

Not many people know that you can add more stickers to the existing collection. Just click on the icon with shopping basket at the top of the chat window.