I think I have a hacker, keyboard stroker! I can't backspace can't use !y emoljis nor can I comment on Facebook, also my Facebook sign in screen has been changed but not by me! Please Help!
Not sure what you mean by your "facebook sign-in screen". Do you download and install apps from outside Google's Play Store? If so, it's *possible* you have gotten hold of some kind of malware, although it's hard to determine exactly what you are describing.
At this point, I would recommend making sure you have any personal data on the device backed up, and do a factory reset.