What are mature websites for 11 year olds?

What are mature websites for 11 year olds?
webkinz.com
clubpenguin.com
pogo.com
crayola.com
coolmath.com
funbrain.com
nick.com
disneychannel.com
kidswirl.com
neopets.com
secureinternet.friendpages.com
glittermaker.com/
kidschat.net/
peerpalace.com
sconex.com
habbo.com
hubbabubba.co.uk/
www.millsberry.com
www.myjellybean.com/
www.kittenwar.com