Memory Game for Facebook

We are looking for a freelancer that helps us to develop a memory game for Facebook with some extended feature. The concept is that people can play classical memory game with profile picture of their friends. There is already a simple prototype for demonstration at [login to view URL] The goal is to add multiplayer feature that allows people(friends) to play together. Please note that the game is developed in Javascript and not in Flash. Good knowledge of Javascript is required. An understanding of, and expereinece in, developing Facebook games/apps, including Open Graph and the Facebook concepts of Objects and Actions, Canvas Page, Notifications and Requests, access to the Newsfeed and Ticker via the Social Channels API, the posting of Discovery Stories, publishing to the Feed Dialog, Time Line, and Achievements, is advantage.