small social network

I would like to build a site similar to [login to view URL] Website DESIGN should be similar [login to view URL] The mobile side should be a web app. huge different between web app and mobile site.. The difference: [login to view URL] I would like the mobile web app to request users to install the app before use like [login to view URL] is when you visit it on a mobile device. -Have splash page -Have mobile app -Have profiles walls with profile questions -Login/Register ONLY via facebook/twitter to sign up. -Restrict signup ages for 13-19 via facebook and twitter except for administrators.. -Allow user profiles to be accessed within root directory.. (example: [login to view URL]) -Allow friends -Add instant chat service -Add in messaging system. -CMS based. Registered Teens should: 1. Come up with a vision for their very own startup. 2. Post an "envision" (a video/photo with text describing their idea) explaining their startup idea. 3. Have it automagically ask users to promote "envisions" to their Twitter and/or Facebook. 4. Allow anyone to donate $5 (in quantities) without a registered account and send 80% to users paypal and 20% PentaPlate.