I want to know if there is a way to figure out where the traffic from Facebook came from.
Actually I want to know the users that posted a link to my page.
Each link from facebook has 4 arguments : u (my url), h, enc and s.
I think that argument 'h' has something to do with that.
I don't want to know which user opened the URL! I want to know the profile where the user found the link to my page.
You can´t find out which user opened the URL, unless you authorized the user with an App on that website.
Edit: Sorry, i misread the part about the user. But of course it´s not possible to find out who posted it either. That would not even be possible with any authorization.