Facebook will not open on my iPhone, tried everything I could think of

I have deleted FB and reloaded it, didn't work. I have tried rebooting my phone, didn't work. Deleted caches and cookies, didn't work. Loaded a free app and tried FB again, didn't work. All other apps on my phone work except Facebook! Hit FB icon, it looks like it is going go load up, then goes back to my icon page.
I don't know what else to do. Anyone have any ideas?
I can go online and use Facebook, just can't use the downloaded app?

You can testing facebook proxy
at:
http://www.newiptoday.com/
and thanks