You can try Smallworlds.
Try girlsense.com
Well you can try Frenzoo, it's not only for girls but there are a lot of girls, you can dress your avatar in the last fashion and join fun contests!
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well this is not really for girls only its for guys too. www.supersecret.com that's the best website ever you can play games earn money buy cloths for your avatar. and you can dress your avatar. its the best website ever.
Well lets see sparkcity world is a virtual world for girls only.
try www.barbiegirls.com
there issmallworldsmovie star planethowseweeworld
fun websites are for girls are imvu.com stardoll.com nick.com bearville.com moviestarplanet.com
Well I know a few virtual worlds that don't need email. Like Howrse.com, ponyisland.net, and moviestarplanet.com.
i-dressup stardoll fantage weeworld
Girlgamezone is a games website for girls, focused on virtual games, 3d, Sims, and virtual worlds and games arcade.
Barbiegirls.com fantage.com (For boys and girls) goSupermodel.com Zwinkycuties.com And many more!