I have a fair amount of Facebook development experience, but this had made me pull my hair. It must be something very small, but I can't get it. I recently saw some Facebook pages with welcome tabs that show user's name "Welcome [YOUR NAME]" who visits their page. Example is here:
https://www.facebook.com/Tony.Samaha.Official.Page
As per my knowledge, we cannot get the user id without the permissions by the user. After the permissions we are able to get the user id in the signed request. How do I get the Facebook user id or name, something similar to the above example? How is this working? Can this be achieved?
FYI: I am using iframe tab.
The user is still using the old static FBML application, so most likely they are using the fb:name tag. Though, I believe this is now deprecated. So really, the page you linked to needs to be updated.