My Twitter stream is being swamped by people claiming the iOS Facebook app is crashing for them today. It doesn't seem to have anything to do with the recent iOS 6.0.1 or iOS 6.1 beta 1 firmwares either, and people who haven't gone near either of those are reporting the problem. It also doesn't seem to be a problem for everyone, as other people are saying they're just fine.
Maybe some piece of content is causing a problem for those folks unlucky enough to have loaded it? Who knows. Let's hope it fixes itself, or Facebook fixes it, as soon as possible.
In the meantime, if you use Facebook for iOS, let me know if it's working for you, and if it's not, how it's not.
And if it's not, remember, you can always use facebook.com to get at least some of your fix in the meantime...