Is anyone having trouble with their facebook app on iphone?

I have the iphone 4 and never had any trouble with my FB app until a few days ago when I updated the app. Since then I have not been able to bring up FB on my phone. I hit the icon, a blank screen with the blue FB bar at the top comes up, as if it's trying to load, then, within 2 seconds, the screen disappears and returns to my home screen. I was thinking it might just be a glitch with FB that would be fixed soon, but that hasn't happened. I've tried deleting the app and re-downloading it a couple of times now, but I'm still getting the same results. Could this be a problem with my iphone or is it just a bad app? Any ideas of what I can do?