this is so much fun! so far the differences haven't been great, but read this list of meanings for same or similar smilies - it's smiley knowledge i've picked up in forums with an overwhelming majority of female members and i think that may have biased one or two meanings:

- "WOW! LOOK at that!" (impressed beyond words by something or stunned by image of extremely good looking member of opposite sex) or of course the hard to see option.

- playing with gadgets, games, coding...", "I figured out something that makes me a pc geek", "I'm going to show you some impressive math/science/hack" and "i've used a rather technical and not too user friendly software to do this".

- "really angry", "evil" or "pms monster"

- "melting metaphorically", either by really cute image of for example animals or little children or by hot image of member of opposite sex
ofnuts: seems there is a lot more meaning in our gimp tool icons than i thought. how about these:

- my OS trouble is driving me to tears...

- ... and it's so bad i used the whole packet of tissues...

- ... then i lost it completely and smashed my screen here, here, here and here...

- ... and this is where it all ended up.