Even Better, Roblox is the best mmo game on the internet. It is the only game where you truly make your game, unlike the cartoon network "make your own games" Roblox is three d and it's sort of like legos. due to lua scripting, you can make anything from planes to cars, rockets to bullets, guns to turrets. The best part is, people can alow others to use what they made so others don't have to do the work.
Club Penguin
marapets, webkinz, poptropica, club penguin (membership required for most of stuffs)
Stardoll
Poptropica
If you are growing up try Runescape or Tengaged. If you are looking for similar sites try Poptropica, Bin Weevils or Moshi Monsters?
There is: dizzywood club penguin and club penguin planet
Fantage. It's just like Club Penguin but with people! Enjoy! :)
Yes ,you can play club penguin on i Mac.
Yes
MoshiMonsters,Minyanland,WoogiWorld and CoolCamels.
poptropica.comwebousars.com clubpenguin.com (of course)
club penguinfight my monster... and other sites