title: Facebook Canvas Login
body: <p>What is the best way to login to a Facebook Canvas app? All the tutorials I see show a user needing to press a login button which seems odd since the users is already logged into Facebook. Other apps that I have seen on Facebook show a "Go To App" button. What is the process to get that dialog to show up with extended permissions? Is the oAuth Url redirection the best way to give my app access to the users information? </p>