If you want a realistic multiplayer virtual world, body language and facial expressions are two things that help make it happen. So far this has been very limited but there is now some technology that may help.
Here’s a company called Mixamo
If you spend a lot of time on a computer, game console or smartphone, chance are you have a camera watching you. The XBox systems have Kinect camera. I wonder if this Face Plus technology can be used to make your character talk and emote? Of course it won’t make much difference in games like racing or first person shooters. Let’s face it, when somebody is shooting you with a rocket launcher, you won’t be paying attention to their facial expressions! This could however be really cool in things like Second Life.
This sort of technology can also be used in online learning so the teacher can see avatars of their students with facial expressions.