Hi,
You found the right Contractor who is fully able to do your project efficiently from right now. I can ensure you that our main focus is always on the quality of the work.
i have gone through your requirement briefly and understood your requirements , to determine estimated time duration and to tell you total billable hours , i would be needing one important thing from you to determine all these , that would be FRS(Functional Requirement Specification).
for creating facebook app , we would be needing your server details and the flow of the app (of how you want it to work , like a flowchart) .
the most important thing in this project is facebook approval , which not everyone gets so easily . so ping me in PM so that we can discuss this project in detail and begin the work