There are

200 virtual worlds for youth currently live or in development. The business models they use range from subscription-based to microtransactions and retail, with the advertising-based model also holding a considerable portion of the pie (chart). The majority of these worlds are kid-oriented, with worlds for tweens (8-12) and teens (13+) on the 2nd and 3rd place. Charts and additional data in the VWN article.

The ‘Hate’ Diagram… from a 16 year old

Really cool insights from January’s Dazed & Confused on how teenagers view each other within their social segments