title: FeedDialog using WebAuthenticationBroker
body: <p>I am developing a Store App in which I need to publish some message and image on user's profile. Using WebAuthenticationBroker I have allowed the user to login and it returns a token but then I want to open Feed Dialog. How can I achieve this? I have read publishing text on facebook is possible using WebAuthenticationBroker but could not found any code for it. So my question is which url I need to pass in WebAuthenticationBroker</p>