Every time you use three or more smileys, it means: "I really have nothing to say here at all, but I want to make some kind of noise, so I'm going to throw a bunch of little pictures at you that you've already seen many times before."
Every time you badger the h2g2 team for a new smiley, it means: "Please give me another brightly-coloured cudgel with which to bludgeon the subtle art of communication to death."
Every single time.
Please bear this in mind and converse responsibly. Thank you.