Create website like facebook + online shop website

I am looking for someone who knows how to create website such that people are able to create online shops at my website so that they can sell their items there. And also if best includes afew other features like auto counting of stocks, graph of sales, mthly profit and such. Also includes functions something like facebook chats where customers viewing their online shop may chat with them on the particular item. Example of such website like [login to view URL] Looking for people who are able to create such websites. thanks!