iam hacked in facebook please solve my problem
I think you need to be asking Facebook to solve your problem, not us.
Dont take tension you can easily solve this problem you can mail to facebook tell them your account is hacked they can ask you 2-3 question as related to account if you can gave answer they can removed your account.
Change privacy and account Settings, just like security question which you enters in facebook change that question and the password
Ask Facebook about it (if it's been hacked)... unless you forgot your password and think its hacked, then that is a totally different story.
Change your password regularly. I am talking about quarterly. Got to stay active.