Facebook Glitch

So last night my phone is like here is a software update for the latest Iphone software. So I go ahead and do it thinking things will be better. The next thing I know FB won't even let me do a post when I try to type one letter it shuts my fb down??? Ive restarted my phone several times and nothing helps. I've logged in and out of fb and that doesn't help either! Any help is greatly appreciated as the help on fb is useless!