The masks of inscrutability, or are you really you?

[the phantom]

they can only portray a single emotion at one time

Then use multiple smilies, silly.

Also, you might have to take into consideration of facial expressions

Oh, yes, I definitely agree that facial expressions are vastly superior to smilies. I absolutely hate talking on the phone because I can't stand hearing someone's voice but not being able to see their face. But at least in writing, you don't get the voice either, so the lack of facial expression doesn't bug me so much. I just focus on the words, and the more words I've read from a specific individual the better idea I have of what their facial expression is when they post certain things.