Twitter,MySpace,Well those are the most popular.
peoplewordsforkids.com
terra monsters
Runescape
everloop
kidswirl
do it on facebook
facebook, reddit, twitter, instagram, youtube
Poptropica and Club Penguin are two.
FanlalaEdmodoFantageClub Penguin
Here are a few: menewsha.com roliana.com
meez,hi5,and facebook