Well I did just use it not even 15 minutes ago. I see these threads popping up now and just tried, it starts to load and then kicks out to the home screen. Probably a Facebook problem.
Several users have reported this. I just tried launching the FaceBook app and it crashed. I removed and reinstalled the app and no change. FaceBook must be having a problem.
I'm having the same issue with my 64 gig ipod touch. When it tries to load the app crashes. I'm about to check it on my wife's iPhone. We're both running iOS 4. It was working fine this morning, so I don't know what the issue is. We may have to wait it out. I can't live without this app though, so I hope it gets fixed soon.
Was working earlier today. Tried it after reading this, and, sure enough, it crashed. The facebook app has a history of doing this on my 3G. Heck, it just did it right after the OS4 update for that a few weeks ago.
Everyone needs to login to facebook on your computer and click on account, then help center, then mobile, then bugs and known issues, then click in the thread "I'm having trouble with iPhone application" and click "here" to report this issue. Maybe if everyone reports this it will be resolved quicker...i just did.
Facebook app. started crashing immediately after by daily backup, it was working fine before it was synced, tried to reinstall many times but zero luck, looking at adjusting my prefs/acct. setting just in case