I want to create an entrance app for some events at a congress. Only users which liked our company-facebook page before should be allowed to enter.
I was reading around the last days, that it is not possible (only if the user logged in with facebook connect on our site) to see via the Graph API, which users liked our page? We would have the email adress (over an external registration form), but not the FacebookID.
I'm wondering if there are solutions outside, which i didn't found...