we want to build website integrated with two mobile applications (iphone android) similar to foursquare

Project Description:
we want to build website with two mobile applications integrated (iphone and android) for a foursquare like web application that we currently design.

- users will create an account (facebook/twiter login should works.

 - add/invite friends from twitter facebook accounts.

- check-in to a place.

- create new check in location with approval from our control pannel. (web app)

- see a list of places near by (geolocation) and who checked in there.

- two types of Golden accounts for users with special features

- see on a seperate tab punch cards and how many punchs user has on each card and money bonus.

 - see friends activity (check-in and like-comment)


- the mobile application should communicate with the webapp (send/receive/show data)

Submit your expertise on the above tasks, your best offer and achivable schedule. all codes will be delivered open source. 

Skills required:

Android , Geolocation , iPhone , Mobile Phone , SQL