Fun Sites Like Poptropica HELP!! Any Fun Sites For Teens Or Preteens???

HELP!! Any fun sites for teens or preteens??? - fun sites like poptropica

My little sister (who is) 12 years old wants fun sites to continue. I see no coudnt She also said she already knew. It could help the world? All responses are welcome. You already know about these:
Webkinz, Gaia, clubpenguin, VMK, Dolls, Barbie, Poptropica, gurl, and well thats about it. HELP PLEASE!
Thank you all!
xoxo ♥ ♥