Although we cannot guarantee that all the sites will be what you are looking for, or what ages they will suit, here are some suggestions from various WikiAnswer users:
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My Top List.
1. Maplestory.com
--Completely Free if you don't mind not having nexon cash which can buy you amazing clothes, better hair, eyes etc (not essential). Maplestory is a MMORPG (massive multiplayer online roleplaying game). Millions of people log into maplestory everyday. Must have 2 GB available as a download is required.
2. Habbo.com
--Completely Free, if you don't mind not having a cool room and lots of credits (habbo currency). This is just a place you can relax and chat.
3. Runescape.com
--Completely Free, if you don't mind being basic. Like maplestory, not the nexon cash, though.
I would suggest...
DIZZYWOOD.COM, ANIMALJAM.COM,u can b a wolf o that one, AND FACEBOOK.com is good if ur parents will let u have an acount on it. Dizzy wood stinks my favorite and many others favorite is combat arms never heard of animaljam or if your young try clubpenguin if your a like 8 or over try small worlds.
second life if you want a 3d world where you can talk through the microphone on your computer and chat in the chat box to other online players (needs to be downloaded to be played) I had no problems with Downloading it, although the program is slow for me. But its free, But i think you need to pay for it to buy stuff like clothes etc.
Onverse Is a good online game if you like to walk around and shop (you must pay for the game if you want to buy stuff like pets,clothes,houses etc) You can also chat online to different players and make friends and design your house and charecter. (Download is needed to play this game)
Imvu Is a good online game where you can buy clothes without paying, you earn money buy watching videos or filling out surveys. You can pay if you want to get certain items, but I dont think that you really need to pay unless you like something that you have to pay for. (Download is needed to play the game) Its a fast program for my computer, takes a couple of minuets to load everything in the room, The chat is really good, and its an easy way to make new friends online!
Here the ones that I know but there is way more out there to find out: Poptropica, Fantage and Witch Me. If you go to fantage, then go to downtown on Fantage there will be a whole bunch of people for you to meet and lots of clothes in the shop. If you go to Witch Me you will find that its sometimes quit and sometimes people are talking, also im just telling you that you can use magic there and buy wands and stuff. Finally if you go to Poptropica its the most quiet out of the 3 BUT there is more action and things to do. I hope you like these ones but if you dont try to find some more yourself. Bye!
The best ones are the ones who care about their customers and There.com leads that pack. There are also Second Life, Kaneva, Zwinky just to name a few of the more popular ones.