We all know the facebook chat, it’s very useful sometimes

Although the purists will say that’s useless, there are many icons implemented in Facebook.

For some of them, you didn’t even think they could exist.

Here is the list

As a bonus, there are text markups too :
For making a text bold you can surround it with stars ( * )

And to underline, just add “_” at the beginning and the end of the wished text.

Source : http://www.messengeroo.com/facebook-chat/use-facebook-emoticons-chat-shortcut-keys-symbols/