What are some fun virtual worlds to play

Well I only have one but I think it is THE BEST virtual world ever - Planet51. You can do lots of things with it like play games, make friends and do lots of quests. You can also dress up your alien member or non-member (although I don't think they have members but I am not sure). I love it and it is so much like the movie. I hope you try it out because it's totally awesome!There is also wizards101 which is really fun too! you have to down lode it but it is free and has a lot of fun quests and lots of different adventures!