In terms of the site itself, I would want Ты to be able to change your username. Some sites only allow Ты to do it every 6 months after Ты last changed it, so even if Fanpop would just do that, I'd be a lot happier with the site. And if there was an app, that'd be awesome!
I would make the site a bit еще similar to Facebook, create an app, give it connecting to other websites, I would allow Имя пользователя changings too.
The only thing I'd like to really see on Fanpop is еще Трофеи and еще opportunities for Ты to get to talk with the admins of the site, like Dave and Cliff.