Trouble with the facebook app for iphone?

[Cassie]

I've had my facebook app for a while now and just then it randomly logged me out, and i've never had to log in again as long as I've had it, and I can't get back in. I type my details in and it just sits here loading for a long time. Just wanted to find out if anyone else has had this problem, should I just leave it and try again later? Thanks
Thanks for your help guys, it actually randomly started working not too long after I posted the question, so I guess you just have to wait it out!