clubpenguin.com
agame.com
Pretty Much any website has an option for 'Girl' games, or different sections:
Ex.
Makeup,
Hairstyling,
Design...Dress up.
YES!!! This one is WAY COOL and Fun. TWEENS LOVE IT: tweenworld.
go to youtube and look up cool teen girl rooms. i wish i could give you a better answer.
you could try 4tnz.com ,its funny and sort of like J14 mag
www.izandkenna.webnode.com
The best technology device for your tween depends on what kind of device. if you would like to get your tween is a boy and wants a portable device get him a 3DS, for younger kids. or you could get a psp, for older kids. if your tween is a girl then get her a phone and she will love you for ever, if she already has a phone then get her a ipod or ipad, which will work for any age. if you would want to get a non-portable device then get a boy a xbox360 and a girl a wii. or if you have 2 tween get a wii so the whole family can have fun at the same time.
there is girlsense.com and weeworld.com
iheartbarney.webs.com It's not about barnet at all!
I would say Fanfiction.net, it is really cool
I have no clue but swimmings beast
there is moshi monsters
I recommend imvu it's cool
marriland.com and it shows you all the gameplay videos and walkthroughs