I think my account was hacked or someone is using it without my permission.
Try Guided Help
Our guided help tool can walk you through the steps to resolve your issue.
If you think your account has been hacked or taken over, you should visit this page to secure your account. We'll ask you to change your password and review recent login activity.
Your account may have been hacked if you notice:
You can also review these tools and tips to help keep your account safe. You may also want to learn how to protect yourself against malicious software that can potentially compromise your account.
Note: If the email associated with your Facebook account has changed, you can reverse this. When an email is changed, we send a message to the previous email account with a special link. You can click this link to reverse the email change and secure your account.
This content is from: https://www.facebook.com/help/hacked