In my opinion following 3 (really important) smiley's are TOTALLY missing:

<-- possible code for it :coolface:

<-- possible code for it :facepalm:

<-- possible code for it :megusta:
Reason why they should be implemented ?Well the coolface smiley is very important to tell someone that what you just said was in a sarcastic way of meaning and not totally serious.
The facepalm smiley.. well i guess theres nothing really to say about it. it's for the people who failed hard with what they're just talking about.
The meaning of the megusta smiley is more intense then the

smiley and it's
up2date!
Personally i have at least 5+ moments a day where i miss the opportunity to use one of these 3 smileys...

I guess it's not really a hard job to implement them so please think about it (twice) !