vilate

I'm trying to figure out how to create a site where people can register and post items so that all registered users can see, but that is protected so there's nothing on the home page but an intro and a place to login/register. I need it to be more advanced than forums. I've looked into pligg, but it's not exactly what I'm looking for.

Does anyone know how difficult it would be to create something that's like a cross between myspace and a forum?

Thanks!