Not emotions, emotiCONS - little pictures of facial expressions made from different keystrokes. The most famous is the smiley. These days there are loads of emoticons - whole dictionaries of them, in fact. Now you might think this is way too geeky for you, but you don't have to use them. You can't stop language from evolving, for instance, we tend to abbreviate automatically.
Emoticons are just another form of shorthand.
The Internet is forcing written language to evolve at a ferocious rate. Check out our links page for this and the other Newsgroups Gareth has been looking at.