433385 location based app like foursquare & gowalla

Hello, we need a company which will create something similar like foursquare & gowalla for iphone. We need a mobile app that will utilise gps and deliver location based information from our geocoded information database. The app should also be able to deliver locations and [login to view URL] from our products database to enable users to purchase products. Photos and videos upload. User generated content upload. It should be possible to log in via Facebook Connect. User can check-in and update status to google facebook, twitter and other social networking sites. - user can add new locations - after checking-in user can upload a picture, leave a tip, able to add comments. - user could able to like, follow and follow other users - user should be able to let user control privacy in account. We also need a web backend for users just like gowalla and foursquare. Please send us your portfolio of your mobile applications, and send us detailes information which technology (writting language, framwork, database engine, etc.) you will use to build the app and the web backend.