How to recover a hacked Facebook account
Go to www.facebook.com/hacked and select the "my account is compromised" option. After that, carefully identify the account by entering the username, email address, or mobile number. Now, Facebook will prompt you with a series of security questions, including the account's old password, if you enter the captcha (special code) in the "security check" option. The complaint will
Source: thedailystar.net