I know of a few. CartoonDollEmporium.com is a great website. It's lots of fun. You can do all sorts of stuff, from blogging to setting up your own profile. You get avatars and can buy clothes and such. You can play games to earn money. It's a great website, the members and the staff are all very into it, and it's not a site creepers can easily get on. I played it for 2 years before I grew out of it. I'm 15. Sometimes I still want to go back and play it, it was that good!
the best website in the world for tweens is thetweenmagazine.com
spark city is a good website because the chatting is safe and also its fun for tweens it's for everyone but recomended for tweens
It is a website for kids,tweens, and teens.
H2O Just Add Water is a popular show for tweens, it is good and fun to watch and i am 13 and i like it
The 2nd most popular website is en.wikipedia.org.
A popular one is FreeRealms.
My daughter reads: The Clique, Agatha Christie books, The Twilight Saga and Pretty Little Liars
the most popular website game for girls is www.girlsgogames.comthe most popular website game for boys is boysgogames.com
no YouTube is not the most popular website google more popular so is Twiter and facebook
The best virtual world for tweens to play on is www.ourworld.com. it is easy to get started on and entirely FREE! On most virtual worlds you need to purchase a membership but on ourworld you don't. Most of the items are available for ALL members. www.ourworld.com is the best website for a tween virtual world.
The most popular domain name would coincide with the most popular website on the internet. Google.com isconsidered the most popular and successful website online.
Google is currently, the most popular website in the world, YouTube is #4.