Does anyone know what the custom URL scheme is to open a Facebook page in their new iOS app. I was using fb://page/PAGE_ID however this doesn\'t seem to be working in the re
A custom URL scheme is a mechanism through which third-party apps can communicate with each other. It doesn't allow you the provision to open a page in that particular application. It just fires an event to bring the called Application to the foreground. Going through this documentation would further clear your doubts.
The new Facebook app is built using Objective-C as against previous once in HTML5 which used to support URL scheme mechanism. This link gives a hint on that.
http://techcrunch.com/2012/08/23/facebook-for-ios-faster/