A host of big media companies and entrepreneurs are flocking to the kids space to create new virtual worlds aimed at the 18-and-under crowd, Mediaweek reports.  That's according to a new report issued by the industry trade organization Virtual Worlds Management, which says that there are more than 100 virtual worlds targeted at kids and/or teens, which are either live or in development. Within that group, the majority of new worlds are aimed at tweens (kids in the 8-12 year-old range)--as 65 such worlds are have either launched or are in the works...

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