I think Imvu is fairly good and maybe weeble.
Imvu.com
stardoll
Virtual Teen
Fantage.com (all ages) Meez weeworld neopets.com imvu Stardoll clubpenguin.com (kinda) callofduty runescape zwinky Maplestory(teens)
Second Life is best virtual world for teens.
Ourworld
The Second Life Teen grid was good for giving people under the age of 18 safe access to the Second Life virtual grid. It was however closed down in 2011 and is no longer available
There are a lot of good teen books out there, but some really good ones are Alyzon Whitestarr, The Hermit Thrush Sings, and The Clique.
Some good teen costumes ideas is a bunny,cheetah,zebra,and nerd
Here are some things that teens might deal with:Coming of agefirst lovea significant achievementfitting inmaking friendsdealing with realities of lifea significant crisisa great loss
Justin Bieber