I can't open FB with my iPhone 5c?

I can't open FB with my iPhone 5c?!

Added (1). I use my phone for all my online communications and needs. Anyway, a few days ago when I went to open FB it won't open. The suggestions I have tried online are not working. (ie installing a free app was one suggestion.) Anyone know how to fix this? Thanks.

Added (2). I use my phone for all my online communications and needs. Anyway, a few days ago when I went to open FB and it wouldn't open. The suggestions I have tried online aren't working. (ie installing a free app was one suggestion.) Anyone know how to fix this?

Can you open your Facebook on a computer?
have you tried opening facebook using a browser like safari or opera or chrome on your smartphone?
does your password start with a lowercase letter and maybe your app will put in a uppercase unless you backspace and enter it again?

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