Need a Website built

Need a website that uses the following sequence: Sign up upon visit homepage: username / email / password - confirm email upon sign up After sign up and confirmation of email, user obtains own page "/username" to create content as well as list an item, website, blog, product they want to sell or promote in an easy to use development template. The information entered needs to be presented in a very clean and sophisticated way. User needs to be able to edit their page, as well as view their page once they are finished editing / creating. User should be able to add, edit, remove content from their page with relative ease. As a user updates their "/username" page it should be posted to a "feed" of content on a "central page." From the central page feed users should be able to comment on what is being promoted as well as be able to share it to facebook / twitter etc. Site needs to have a clean sleek looking design to it but nothing overly fancy. It just needs to appear as simple as possible, not a bunch of bells and whistles. More details about site name and concept will be given to the coder selected for this project.