Here are some examples - Club Penguin: Good, a nice place to meet new people, but you can hardly get clothes unless you get membership. ROBLOX: Your a lego character, you can make a place, buy hats and clothes, visit other places and join/make groups. Must have BC, TBC, or OBC to buy most hats and packages and make groups. Webkinz: You buy a stuffed animal, enter it's code on the internet, then name it, dress it, etc. You can't freely chat, you must use a safe-chatter. minecraft: You build, just like ROBLOX, and you can get membership, it graphics aren't very good, but it's an okay game. Wizard 101: Cool, get a house, fight enemies, cange clothes, get missions, but you must get membership in able to get far inside missions. Travian: Roman times, good if you like history and economics. Mafia Boss: I recomend this as a muture game, but you can join and make a mafia, all that stuff.
FantagePoptropicaSome of the Facebook games
Xivio.com is great! Its a 3D no download free virtual world!!!
Onverse is a good choice!
ONVERSE!it is the best virtual world sign up here
MoshiMonsters.com ClubPenguin.com
dizzywood is really good
Smeet is a Very good virtual world. I love it
clubpenguin.com poptropica.com habbo.com (this is a really good one for teens) neopets.com
Any Virtual Worlds For Teenagers Were You Can Be A Fairy
Xivio.com is great! Its a 3D no download free virtual world!!!
habbo
Nearly all games that include a virtual world are advised for players from 13 year and over.