emoticonos

The most widely used is :) 

Other common ones are :(  (frowning)

:->  biting sarcasm

;-)  winky smile

Less common ones are   : *)   ( user is drunk)

:´(  ( user is crying)
+:-&  ( user is tongue-tied)

Acronyms are also used to save time and space

TTBOMK  ( to the best of my knowledge)

ROFL ( rolling on floor laughing)

TANJ  ( there ain´t no justice)