It's basically a sort of social network meets online economy meets arcade meets room decorator. I'm not particularly good at explaining things of this sort, but give it a try. It may seem overwhelming at first, but it's easy to figure out, even without the crapload of wiki articles they have. It helps build egos in the way that you can earn money in games and make a nice room and brag about it. You're generally free to do what you like. Also, if you have knowledge in Flash you can list stuff for others to buy. If you want to look for me in-game, my name is Spoadock. Identifying yourself as someone from these forums would probably earn you a bar (premium currency), considering not too many sign up and mooch them off of me.
http://whirled.com/But if you would kindly do me a favor, come to my referral link so I can earn more bars to give away:
http://www.whirled.com/friend/7912326/world-s6940670
Pic is my house in-game. (changing soon, only one author's art style fits there and I don't like limiting myself like that. Especially when they haven't made a lot.)
Someone is bound to make fun of my name. It's an inside joke, I used to play with my irl friends only.