Facebook recently announced that it would no more support new FBML (Facebook Markup Language) based applications. Accordingly the option to create new FBML apps on Facebook has now been removed and developers can now create only Iframe based applications on Facebook. Static FBMLs have been also deprecated to a great extent.
One method of interacting with users on Facebook used by many brands is the Fan Page tab by getting the currently logged in Facebook user's ID. However with new Iframe fan page tabs, the method is a bit different. In this article we will tell you how to get the Logged In / Current Facebook User's ID on Iframe page tabs.
You can check out a live demo here: facebook.com/digitizor?sk=app_150734978329989
You can read more Facebook API Development articles on this page. If you are facing any problem with the implementation do write to me at: email@example.com. You can also hire me for developing Facebook applications for you.
Let us know in the comments section if you face any problems.