Henrik Torstensson, head of strategy at Stardoll - http://www.stardoll.com a site targetting tween girls and general manaer Piczo, http://www.piczo.com a social networking site where you can easily design your own site, blog, avatars and use games, music, quizzes...
focus on a theme and have branch specific people giving their feedback with a possibility to let people participating in the event have a chance to do select networking.