Development of new ''Membership'' social media website for sports/exercise enthusiasts

I am looking for someone to help me to develop a new social media 'Membership" website for sports enthusiast. Need help with all programming and site functionality --We have a great idea, but need people who know how to set-up a site similiar to Facebook ---(this is an entirely new and unique application). Must be able to develop a software/ app platform that can be used on all devices such as; cell phones, smart phones, i-pads, laptops, note-books, etc... Need help in project development.