photo sharing platform

I want to develop a photo sharing platform like any of the many - Pinterest, Instagram... So it will have photo storage, photo interaction (e.g -you click on it - displays a larger image), photo search with a query and a photo share mechanism (social network, mobile....) What I need is an architecture of the components to be used for the front end and the back end. You can do it as a diagram of different modules that it should contain and what options are there for each module (like for database, for search, ...) and indicate the best option for each. Also give the best option for web hosting and opinion about using cloud computing. I am looking for a solution that is cost effective, efficient and scalable.