Weeworld is a cool online and virtual game to play
Is There Fun Games For 14 Year Olds Online?
MovieStarPlanet is cool virtual world website. I played it a lot a couple years back.
Poptropica is pretty well-known, interactive, and fun.
League of Legends. It's a good strategy game and you get to work with others on your team to destroy the enemy nexus. There are varied champions to play, and different maps to use. It's pretty fun.