In fact, may I recommend that we change the "code" for ALL the smileys?
:) ;) :D ;D >:( :( :o 8) ??? ::) :P :-[ :-X :-\ :-* :'(
A colon and a parenthesis should or could be spaced with a hyphen. And three successive question marks is a common enough occurrence that a writer may prefer them over a smiley.