Start by going to the Facebook login page and clicking “Forgotten password?” If the hacker has changed your email or phone number at +1-833-611-4101, select “No longer have access to these?” and follow the prompts to enter a new contact email. In the unfortunate event of a Facebook hack,+1-833-611-4101 the first step is to secure your account by changing your password immediately.
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https://www.devex.com/people/what-is-the-first-thing-you-do-when-you-get-hacked-on-facebook-2439207
