Cannot sign in my twiiter on any iphone app


yesterday my echofon stopped working i deleted it and tried to download several apps but it wont allow me to sign in. i tried to use twitter through safari and it wont even load. i also deleted my account name from my iphone settings tried to re login and it told me it cannot verify my password. does this have anything to do with my authentification pin? is it expired? i can only use twitter on the web