Example: If you type <('') then press ENTER in Facebook chat, it will be replaced by icon. If you type <3, it will be replaced by icon. But, do you want to remember all those shortcuts and its icon results ?
If you want to install those emoticons into your browser, here is how to do it... check this out....

1. You need Firefox Browser installed in your computer.
   
   If i have only Internet Explorer, can i continue this tutorial ? No
   I have another browser, Opera, can i continue this tutorial ? No
   Ok, i have Safari browser installed in my computer, can i ? No!
   You need Firefox only.
   
   Don’t have Firefox? Haven’t try it?
   



2. Install Greasemonkey add-on https://addons.mozilla.org/en-US/firefox/addon/748, then restart Firefox.
   



3. Install Facebook Chat Emoticons Bar for Greasemonkey http://userscripts.org/scripts/show/50826
   
   This is a script that will modify/customize the output of your firefox browser, that’s why you will see emoticons bar in your facebook chat window.
   
   
   Done.
   It’s so simple to install facebook chat emotions bar, huh ?
   Now, if you want to use any emoticons/smileys/emotions simply click it, and once you press enter, you will see the shortcut code replaced by icon.

Is my chat buddy seeing any emoticon i’ve entered ?
Yes, you both will see it.

Good Luck..!!!