There can be many reasons that you are unable to access your Facebook account. You can either forget your account password or someone may have hacked your Facebook account. If the problem is that you have forgotten your password then you can easily reset your password by using your email address or your mobile number easily but if your account is hacked then it can be a major problem and you should act fast to recover your account because if the hacker has access to your account, then he/she can misuse your account for any purposes. But how to know whether your account is hacked? You should look for some signs such as:- 1) If your Facebook name is changed. 2) Your birth date on fakebook is changed. 3) Messages were sent to people that you did not write from your account. 4) You are unable to log in using your old username and password. 5) Check your profile page for any recent post that you did not write. 6) Check if any friend request was sent from your account. If y...