I see that among multiple smilies, you guys don't have two basic ones...
Those ones: (you can see them in plain text, because currently they don't exist)
:)
and
;)
I am sure you know what those are / represent
Generally, i, often like to use those .. (as find them most appropriate in many cases) .. instead of looking for some smilie from the smilies box on the right. (which is good to have also, by the way)