Facebook app does not works in iphone 4s?

I recently got an iphone 4s and apps like facebook, youtube don't wonk on this phone. When i try to log into facebook i get error as "bad esn". If I try to open these sites from safari browser, I get error message as these sites are blocked. I did some research and found that that the phone may be from china and because of this these apps are not working. I'm in USA currently and trying to open the app/website through Wi-Fi. Rest all websites work flawlessly.

Please help me. I want to gift it to my wife on her birthday and she is crazy about facebook.

Facebook sucks don't use it!

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