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I would recommend you to change your password ***** and enable login approval for your facebook account.
Login approvals are a security feature similar to login alerts, but with an extra security step. If you turn on login approvals, you'll be asked to enter a special security code each time you try to access your Facebook account from a new computer, mobile phone or browser.
To turn on login approvals:
After you turn on login approvals:
Note: You need to have a mobile phone number listed on your account to turn on login approvals. You can add one to your account when you turn on login approvals.