I recommend you use myjuniorbook.com or fbfkids.com and personally I think myjuniorbook.com is better.
I think www.eschoolfriends.com is by far the best.
peoplewordsforkids.com
everloop
Poptropica and Club Penguin are two.
well it depends on the age to me. here are some suggestions -www.habbo.com -www.milsberry.com -www.zwinky.com -www.poptropica.com
You have: Worlize Fantage Woozworld SparkCity World Stardoll Oh my dollz Chit Chat City
Well u have Myspace,Twitter and Facebook.
Runescape
kidswirl
do it on facebook
kind of like Facebook for littler kids. they are usually safer because you dont put real pictures up of yourself and they aren't as personal. they usually have alot of games
facebook, reddit, twitter, instagram, youtube
FanlalaEdmodoFantageClub Penguin