facebook app stopped working

I cannot get my facebook app on my iphone4 to allow me to post status updates or check-in places. It used to work just fine, now it just stopped. It keeps saying the error message below if I try to check in & if I post a status it lets me type and click post, but then the status never shows up. I've emailed facebook support & reported the app problem but nobody (not surprisingly) responded to my complaint. I uninstalled & reinstalled the app and I still have the same problem. Everything is up to date on the phone. Basically the app is just a read only for the news feed & profiles, etc. Any reason why it stopped working or where I can go for someone to fix it??? Thanks!!!