social web application

I need the back-end and front-end of a web application. The back-end can be in either asp.net or ruby. Users would log in either with Facebook Connect, Twitter OAuth or email. They would be able to vote on objects that would contain one picture and some info. (dates, locations etc) The main page would display the objects with the most votes in order. (Filters can be applied for dates, locations, etc.) When voting, users will get an ajax prompt to share with friends. Super Users would be able to register only via email, these super users can create these objects that are voted on. Super users would need to be approved by an admin. Finally, category pages are creating (sort of like a profile page) only by an admin. These pages would have pictures, videos, information, a location etc. (These are linked on the objects that get votes) The design must be simple with emphasis on typography to follow web trends. HTML5/CSS3 is encouraged. Please provide a clear understanding on the project and any sample work in your bids. More information can be provided via pm.