There is a problem with the app and this is what they have in there support page:
"Friendly Facebook for iPad
We are working on a fix for the "Netpad"/black screen issue. This issue is affecting some users on both the new 3.5 update as well as the previous version.
The problem is related to a change Facebook has made to their server, and we are working as fast as we can to provide a solution.
Rebooting the iPad worked for some users. Will post an update as soon as we have a more comprehensive solution."
In hope this help to clarify some of our questions.
stick2e - Sent from my iPad2 using iPF