Los Angeles-based Gorilla Nation Media, the division of Evolve Media which provides advertising representation services to websites, said this morning that it has launched a new kids, tweens, and teens vertical. The firm said the new "Youthology" vertical will help advertisers specifically engage with tweens. Among the first sites in the vertical is Sherman Oaks-based SodaHead, the discussion and polling site co-founded by former MySpace exec Jason Feffer. Other sites in the new vertical include HIT Entertainment, Thomas & Friends, and Barney.