Build me a app similar to WeChat, WhatsApp, Instagram

I need an experienced team capable of designing and programming the current social platforms such as WeChat (most important one), Instagram, and WhatsApp. High level of creativity is a must. Reliability, Usability, Maintainability, Scalability, Security is very important. Preferred Skills: Erlang, XMPP, UI/UX Design, Graphic Design Preferred Database: Mnesia / MySQL (MySQL for different functionalities) Preferred Server: Ejabbered Preferred OS: FreeBSD Platforms: * Stage One: IOS(Actual App), Android(Actual App), Website(admin panel, program management, simple landing page(about us, who we are, basic description...etc)) * Stage Two: Windows Platform (Actual App), Website(full functionalities just like the app) Important Functionalities: Real-time connectivity / Real-time messaging Group messaging Individual messaging / voice call&video chat File sharing Presence indicators Social integrations / third-party apps integration Location sharing Social Functionalities: moment / post / like&comment&report / Stories etc... Friend list/contact list Payment / P2P payment etc.. Marketing platform for advertisers / other more advanced functionalities ............( will continue in private discussion ) We will discuss further about this project after the evaluation of your bid & team.