In a world dominated by social media, it’s hard to not come across a client application which you have used to access restricted resources on some other server, for example, you might have used a web-based application (like NY Times) to share an interesting news article on your Facebook wall or tweet about it. Or, you might have used Quora’s iPhone app that accesses your Facebook or Google+ profile and customizes the results based on your profile data, like suggesting to add/invite other users to Quora, based on your friends list.