Cannot sign into Facebook.com. What should I do?

Hi jm1971...

Sounds like your Facebook Account was hacked.
Do the following suggestion below...As Soon As Possible.
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If you still have access to your account, then you should change your password right away and rebuild your account the way it was before it was hacked.
Report the hacking to Facebook and let them deal with the person that hacked your account.
If you do not have access to your account.
You will need to contact facebook security right away and get them to retake over the account for you.
When you are able to prove that you are the original owner of the account they will then give you back control of your account.
VERY IMPORTANT: Let Facebook know what happened as soon as possible.
If the account was hacked and the hacker is using the account to do some bad stuff, then they will supend your account and possibly delte it because they think that you are the one doing the bad stuff.
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Facebook Security: https://www.facebook.com/security
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Bud