Try Club Penguin. That's safe and suitable for kids that age range. It has a variety of parental controls and has a moderation team which accounts for the cyber safety of every player.
secretbilders
I'd probably recommend Animal Jam.
fantage
Zombie Dooks, Vampire Virtual
yes
Virtual worlds are NOT bad for kids! The people that interact with your child are probably bad. Some are good, some are bad, but virtual worlds are not bad! Virtual worlds are created by people that want your children, teenagers, and adults to have fun when they are bored, or at any time! Their are many virtual worlds, so don't worry about not finding the one that fits you! Good luck! :) - Sally
Try Xivio.com, its a free 3D virtual world. Safe for kids! No download too!
Well, Jumpstart is a very cool and safe online virtual worlds for kids 9 and up, as well as me, i play Jumpstart and it really really good for me!
MoshiMonsters.com ClubPenguin.com
Club PenguinBinweevilsMoshi MonstersPanfuTinkatolli
smallworlds
club penguin is the best! also there is panfu